function CheckForm () {

	//Check there is a word to search on
	// Change form and input names below for your forms
	if (document.frmSiteSearch.strSearch.value==""){
		alert("Please enter at least one keyword to search");
		document.frmSiteSearch.strSearch.focus();
		return false;
	}
	
	return true
}
// add 'onSubmit="return CheckForm();"' to form tag