function IsDate(ctrl,mand){	
	var v = new Array("31","29","31","30","31","30","31","31","30","31","30","31");
	var x, y;
	
	if(IsEmpty(ctrl))
	    return !mand;
	
	//verify format
	if(!Match(ctrl,"^\s*([0-9]{1,2})[/-]([0-9]{1,2})[/-]([1-9][0-9]{3})\s*$"))	return false;

	x = RegExp.$1;
	y = RegExp.$2;	

	//account for leap years
	if(x < 1 || x > 12) 		
		return false;
	else if (x == 2 && !(RegExp.$3 % 4))
		v[1]--;
    
	//check bounds
	if(Number(y) < 1 || Number(y) > Number(v[Number(x) - 1]))
		return false;
    
	ctrl.value = x + "/" + y + "/" + RegExp.$3;
	
	return true;
}

 function IsEmail(ctrl,mand){		
	if(IsEmpty(ctrl))
	    return !mand;

	return ctrl.value.search(/^[\w\-.]+@([\w\-]+\.)+\w{2,3}$/) != -1;	
}

 function IsEmpty(ctrl){
	 return Match(ctrl,"^\s*$");
 }

function IsFloat(ctrl,mand)
{
	if(IsEmpty(ctrl))
	    return !mand;

	return Match(ctrl,"^\s*-?[0-9]+(\.[0-9]{1,2})?\s*$");

}

function IsInRange(ctrl,min,max,mand){
	if(IsEmpty(ctrl))
	    return !mand;
	
	return (ctrl.value >= min && ctrl.value <= max)? true : false;	
}

function IsNumber(ctrl,mand){
	if(IsEmpty(ctrl))
	    return !mand;
	
	return Match(ctrl,"^\s*-?[0-9]+\s*$");
}

function IsPostal(ctrl,mand){
	if(IsEmpty(ctrl))
	    return !mand;
		
	return Match(ctrl,"^[a-zA-Z][0-9][a-zA-Z][ -]?[0-9][a-zA-Z][0-9]$");
}

function IsSelected(ctrl){
	for(i = 0; i < ctrl.options.length; i++)
		if( ctrl.options[i].selected ) return true;

	return false;
}

function IsSelectedFromGroup(sName, frm){
	var bItemSelected = false;
		with(frm)
			for( i=0; i < elements.length - 1; i++  )
				if( elements[i].name.search(eval("/^" + sName + "_[0-9a-zA-Z]*$/")) != -1 )
					bItemSelected |= elements[i].checked;

	return bItemSelected;
}

function IsTelno(ctrl,mand){	
	if(IsEmpty(ctrl))
	    return !mand;
	
	return  (Match(ctrl,"^((\\([0-9]{3}\\) ?)|([0-9]{3}-?))[0-9]{3}-[0-9]{4}$"));
}

function Match(ctrl,expr)
{	
	return String(ctrl.value).match(new RegExp(expr));

}

function WithinLength(ctrl,len){
	var str = new String(ctrl.value);	
	
	return (str.length > len)? false : true;	
}