var timeout = 500;
var closetimer = 0;
var ddmenuitem = 0;

// open hidden layer
function mopen(id){
    // cancel close timer
    mcancelclosetime();
    
    // close old layer
    if (ddmenuitem) 
        ddmenuitem.style.visibility = 'hidden';
    
    // get new layer and show it
    ddmenuitem = document.getElementById(id);
    ddmenuitem.style.visibility = 'visible';
    
}

// close showed layer
function mclose(){
    if (ddmenuitem) 
        ddmenuitem.style.visibility = 'hidden';
}

// go close timer
function mclosetime(){
    closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime(){
    if (closetimer) {
        window.clearTimeout(closetimer);
        closetimer = null;
    }
}

// close layer when click-out
document.onclick = mclose;

function Search(){   
if (document.form.Keyword.value == "请输入关键字") {   
	alert("请输入关键字!");
	document.form.Keyword.focus();
	return false;
}else{
	var gourl=document.form.TOurl.value+"?Keyword="+document.form.Keyword.value;
	window.location.href=gourl;
	return true;
	}
}