String.prototype.trim = function() {
	return this.replace(/^\s+|\s+$/g,"");
}

	function search_chk()
	{
		if(document.frmSearch.Searchstring.value.trim()=='')
			{ alert("Please enter search phrase");
			document.frmSearch.Searchstring.focus();
			return false;
			}
		else{
					var str=document.frmSearch.Searchstring.value.trim();
					//var filter=/^([\w-]+(?:\.[\w-]+)*)$/i;
					var filter=/^([\w\s-]+(?:\.[\w\s-]+)*)$/i;
					//@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
					if (filter.test(str))
						{
						document.frmSearch.action="searchresult.asp";
						document.frmSearch.Submit();
						}
						else
						{
							alert("Search phrase contains invalid symbol!! Please check");
							return false;
						}
			}
	}