$(document).ready(function(){
	if($("#searchword")[0].value==""){
		$("#searchword")[0].value="Input key words";
		$("#searchword").focus(function(){
			$("#searchword")[0].value="";
		});
	}
	if($("#searchword")[0].value=="Input key words"){
		$("#searchword").focus(function(){
			$("#searchword")[0].value="";
		});
	}
});
//搜索表单校验
$(document).ready(function(){
	
	$("#globalsearchform").submit(function(){
		if($("#searchword")[0].value==""){
			alert("Input key words");
			return false;
		}
		return true;
	});
});