function getCheckedValue(radioObj) {
	if(!radioObj)
		return "";
	var radioLength = radioObj.length;
	if(radioLength == undefined)
		if(radioObj.checked)
			return radioObj.value;
		else
			return "";
	for(var i = 0; i < radioLength; i++) {
		if(radioObj[i].checked) {
			return radioObj[i].value;
		}
	}
	return "";
}

function IsNumeric(strString)
   //  check for valid numeric strings	
   {
	   var strValidChars = "0123456789";
	   var strChar;
	   var blnResult = true;
	
	   if (strString.length == 0) return false;
	
	   //  test strString consists of valid characters listed above
	   for (i = 0; i < strString.length && blnResult == true; i++)
	      {
	      strChar = strString.charAt(i);
	      if (strValidChars.indexOf(strChar) == -1)
	         {
	         blnResult = false;
	         }
	      }
	   return blnResult;
   }
 
 function IsDate(strString)
   //  check for valid numeric strings	
   {
	   var strValidChars = "0123456789/";
	   var strChar;
	   var blnResult = true;
	
	   if (strString.length == 0) return false;
	   if (strString.length < 7 || strString.length > 11) return false;	
	   //  test strString consists of valid characters listed above
	   for (i = 0; i < strString.length && blnResult == true; i++)
	      {
	      strChar = strString.charAt(i);
	      if (strValidChars.indexOf(strChar) == -1)
	         {
	         blnResult = false;
	         }
	      }
		  
	   return blnResult;
   }
   
 function showYesNo()
 {
 	return window.confirm("Weet u zeker dat u dit item wilt verwijderen?");
 }