//usage:  onkeydown="enterSubmit(frmSearch.strSearch,event);"
function enterSubmit(whichField,thisEvent) {
	if(window.event) {
		var keyHit = window.event.keyCode;	//ie format
		if(keyHit == 13) {
			validateSearch(whichField);
		}
	}
}

function validateSearch() {
	var alertMsg = "";
	
	if ( document.frmSearch.strSearch.value == "" ) {
		alertMsg += "Please enter some search terms";
		isValid = false;
	}
	
	if(alertMsg.length) {
		alert(alertMsg);
	} else {
		document.frmSearch.submit();
	}	
}