/*
	Common form validation routines 
*/

function checkForm(curform) {
	for(i=0; i<curform.elements.length;i++) {
		var el = curform.elements[i];
		if(el.getAttribute('required')!=null) {
			var fldcaption = el.title !='' ? el.title : el.name;
			switch (el.getAttribute('required')) {
				case 'date' :
					var datecheck = isDate(el.value);
					if (datecheck!='') { alert(fldcaption+'  must be a valid date\n'+datecheck); el.focus();  return false; }
					break;
				case 'string' :
					if (el.value.length==0) { alert(fldcaption +' is a required field'); el.focus();  return false;}
					break;
				case 'number' :
					var fV = parseFloat(el.value);
					if (isNaN(fV)) { alert(fldcaption +' must be a number'); el.focus(); return false; }
					break;
			}

		}
	}
	return true;
}


/*
	**** DHTML date validation script for dd/mm/yyyy. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
*/
var dtCh= "/"; var minYear=1900; var maxYear=2100;

function isInteger(s){
	var i;
	for (i = 0; i < s.length; i++){   
		var c = s.charAt(i); if (((c < "0") || (c > "9"))) return false;
	}
	return true;
}

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

/*
	**** End of smartwebby.com date validation
*/