function setConfirmUnload(on) {
   
     window.onbeforeunload = (on) ? unloadMessage : null;

}

function unloadMessage() {
   
     return 'You have entered new data on this page.  If you navigate away from this page without first saving your data, the changes will be lost.';

}

function forceNum(iRef){
	iRef.value=iRef.value.replace(/[^0-9]/,'');
}
function hidediv(divId,val){
	var i = val.value;
	var arr = document.getElementById(divId)
	if ( arr!= null && i=="no") {
		arr.style.display = 'none';
	}else{
		arr.style.display = '';
	}
}