<!-- BASIC VALIDATION:
function checkrequired(which) 
{
	var pass=true;
	if (document.images) 
		{
		for (i=0;i<which.length;i++) 
			{
			var tempobj=which.elements[i];
			if (tempobj.name.substring(0,2)=="V_") 
				{
				if (((tempobj.type=="text"||tempobj.type=="textarea"||tempobj.type=="password")&&	tempobj.value=='')||(tempobj.type.toString().charAt(0)=="s"&& tempobj.selectedIndex==0)) 
					{
					pass=false;
					break;
			        }
				}
			}
		}
if (!pass) 
	{
	shortFieldName=tempobj.name.substring(2,30);
	alert("U dient het veld "+shortFieldName+" in te vullen.");
	tempobj.focus();
	return false;
	}
else
	return true;
}