function CheckForm(form)
{
	var i;
	var arr;
	var str;
	var x;
	
	var dtCh= "/";
	var minYear=1900;
	var maxYear=2100;
	
	for (i=0;i<form.elements.length;i++)
	{
		if(form.elements[i].name.substr(0,4) == "CHK_")
		{			
			
			str = GetFieldValueByName(form,form.elements[i].name.substr(4));
			
			if(str != null)
			{
			
				str = Trim(str);
							
				arr = form.elements[i].value.split("|");			
				
				switch(arr[0])
				{
					case "STR":
						//check mandatory field							
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field [" + arr[4] + "] is mandatory and must not be left blank...");
							return false;
						}
						
						//check min length	
						if (str.length < parseInt(arr[1]))
						{
							alert("The value in field [" + arr[4] + "] is too short (less than " + arr[1] + " characters)...");
							return false;
						}
						
						//check max length
						if (str.length > parseInt(arr[2]))
						{
							alert("The value in field [" + arr[4] + "] is too long (more than " + arr[2] + " characters)...");
							return false;
						}
						break;
											
					case "INT":
																
						//check mandatory field
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field [" + arr[4] + "] is mandatory and must not be left blank...");
							return false;
						}
						
						//check sanity
						if(!(IsNumeric(str)))
						{
							alert("The value in field [" + arr[4] + "] is catered for numeric values only...");
							return false;
						}
												
						//check min value
						if (arr[1] != "x")
						{
							if (parseInt(str) < parseInt(arr[1]))
							{
								alert("The value in field [" + arr[4] + "] is too small!");
								return false;
							}
						}
						
						//check max length
						if (arr[2] != "x")
						{
							if (parseInt(str) > parseInt(arr[2]))
							{
								alert("The value in field [" + arr[4] + "] is too big!");
								return false;
							}
						}
						
						break;
					
					case "FLOAT":
																		
						//check mandatory field
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field [" + arr[4] + "] is mandatory and must not be left blank...");
							return false;
						}
						
						//check sanity
						if(!(IsNumeric(str)))
						{
							alert("The value in field [" + arr[4] + "] is catered for numeric values only...");
							return false;
						}
												
						//check min value
						if (arr[1] != "x")
						{
							if (parseFloat(str) < parseFloat(arr[1]))
							{
								alert("The value in field [" + arr[4] + "] is too small!");
								return false;
							}
						}
						
						//check max length
						if (arr[2] != "x")
						{
							if (parseFloat(str) > parseFloat(arr[2]))
							{
								alert("The value in field [" + arr[4] + "] is too big!");
								return false;
							}
						}
						
						break;
										
						
					case "DATE":
						//check mandatory field
						if ((str.length == 0) && (arr[3] == "True"))
						{
							alert("The field [" + arr[4] + "] is mandatory and must not be left blank...");
							return false;
						}
						
						//check sanity
						if(!(IsDate(str)))
						{
							alert("The value in field [" + arr[4] + "] is not a valid date (dd/mm/yyyy)...");
							return false;
						}
						
						//check min value
						if (arr[1] != "x")
						{
							if (GetDate(str) < GetDate(arr[1]))
							{
								alert("The date in field [" + arr[4] + "] is less than the minimum date!");
								return false;
							}
						}
						
						//check max length
						if (arr[2] != "x")
						{
							if (GetDate(str) > GetDate(arr[2]))
							{
								alert("The value in field [" + arr[4] + "] is later than the maximum date!");
								return false;
							}
						}
						
						break;
				}
			}
		}
	}
	
	return true;

}

//============================================================================================

function Replace(string,replacechar,replacewith) 
{
	var temp = "";
	var i;
	
	string = '' + string;
	splitstring = string.split(replacechar);
	for(i = 0; i < splitstring.length; i++)
	{
		if(i < (splitstring.length -1))
			temp += splitstring[i] + replacewith;
		else
			temp += splitstring[i];
	}
	return temp;
}

//============================================================================================

function GetFieldValueByName(form,name)
{
	var i;
	
	for (i=0;i<form.elements.length;i++)
	{
		if(form.elements[i].name == name)
			return (form.elements[i].value);
	}
	return null;
}

/*

======================= STANDARD HELPER FUNCTIONS BELOW =======================================

*/
function IsNumeric(str)
{
	var i;
	for(i=0;i<str.length;i++)
	{
		if(!(	((str.charAt(i) <= '9') && (str.charAt(i) >= '0')) ||
				(str.charAt(i) == ' ') || (str.charAt(i) == '.') || (str.charAt(i) == '-')))
			return(false);
	}
	return(true);
}

//============================================================================================

function IsAlphaNumeric(str)
{
	var i;
	for(i=0;i<str.length;i++)
	{
		if(!(	((str.charAt(i) <= '9') && (str.charAt(i) >= '0')) ||
				((str.charAt(i) <= 'z') && (str.charAt(i) >= 'a')) ||
				(str.charAt(i) == ' ') || (str.charAt(i) == '-') ||
				(str.charAt(i) == 'ü') || (str.charAt(i) == 'ä') ||
				(str.charAt(i) == 'ö') || (str.charAt(i) == 'Ü') ||
				(str.charAt(i) == 'Ä') || (str.charAt(i) == 'Ö') ||
				(str.charAt(i) == 'é') || (str.charAt(i) == 'ß') ||
				((str.charAt(i) <= 'Z') && (str.charAt(i) >= 'A')) ))
			return(false);
	}
	return(true);
}

//============================================================================================

function IsAlpha(str)
{
	var i;
	
	for(i=0;i<str.length;i++)
	{
		if(!(	((str.charAt(i) <= 'z') && (str.charAt(i) >= 'a')) ||
				(str.charAt(i) == ' ') || (str.charAt(i) == '-') ||
				(str.charAt(i) == 'ü') || (str.charAt(i) == 'ä') ||
				(str.charAt(i) == 'ö') || (str.charAt(i) == 'Ü') ||
				(str.charAt(i) == 'Ä') || (str.charAt(i) == 'Ö') ||
				(str.charAt(i) == 'é') || (str.charAt(i) == 'ß') ||
				((str.charAt(i) <= 'Z') && (str.charAt(i) >= 'A')) ))
			return(false);
	}
	return(true);
}

//============================================================================================

function Trim(str)
{
	//trim leding spaces
	while(true)
	{
		if(str.charAt(0) == ' ')
			str = str.substr(1);
		else
			break;
	}
	
	//trim trailing spaces
	while(true)
	{
		if(str.charAt(str.length-1) == ' ')
			str = str.substr(0,str.length-1);
		else
			break;
	}
	return(str);	
}

//============================================================================================

function IsDate(argDate)
{
	var daysInMonth = DaysArray(12)
	var pos1=argDate.indexOf(dtCh)
	var pos2=argDate.indexOf(dtCh,pos1+1)
	var strDay=argDate.substring(0,pos1)
	var strMonth=argDate.substring(pos1+1,pos2)
	var strYear=argDate.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
		alert("The date format should be : dd/mm/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (argDate.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(argDate, dtCh))==false){
		alert("Please enter a valid date")
		return false
	}
	return(true);
}

function isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}


/*


function GetDate(argDate)
{
	//use IsDate() first !!!!
	
	var date_split;	
	var tdate, tmonth, tyear;
	
	date_split = argDate.split('/');
	
		
	tmonth = parseInt(date_split[1]);
	tdate = parseInt(date_split[0]);
	tyear = parseInt(date_split[2]);
	
	return date = new Date(parseInt(date_split[2]),parseInt(date_split[1]),parseInt(date_split[0])-1);
		
}

*/