function addLoadEvent(func) 
{
    //把所有的window.onload事件处理函数的值存入变量oldonload
    var oldonload = window.onload;
    
    if (typeof window.onload != "function") 
    {
        //如果这个处理函数上还没有绑定任何函数,就把新函数加载给它.
        window.onload = func;
    } 
    else 
    {
        window.onload =function() 
                        {
                            oldonload();
                            //如果在这个函数上已经绑定有别的函数,就把新函数追加进来.
                            func();
                        }
    }
}
function ChangeImgOver(btn)
{
btn.className="btnOff";
}
function ChangeImgOut(btn)
{
btn.className="btnOn";
}
function change(id)
{
	document.getElementById(id).style.color="#df3301";
}
function changeBack(id)
{
	document.getElementById(id).style.color="#ff8a00";
}
function ChangeImgOff(btn)
{
	btn.className="btnOff";
}
function JumpToSearchResult(id)
{
    var str=document.getElementById(id).value;
    if(str=="")
    {
        location.href="Restaurants.aspx";
    }
    else
    {
        location.href="SerachShop.aspx?searchStr="+str;
    }
}
function ChangeSearchImgOver(btn,path)
{
btn.src=path+"image/search.jpg";
}
function ChangeSearchImgOff(btn,path)
{
btn.src=path+"image/searsh.jpg";
}
function JumpToSearchResultOutPage(id)
{
    var str=document.getElementById(id).value;
    if(str=="")
    {
        location.href="../Restaurants.aspx";
    }
    else
    {
        location.href="../SerachShop.aspx?searchStr="+str;
    }
}
function ChColorOut(id)
{
alert("1");
    document.getElementById(id).style.className="menu_up";
    alert("2");
}
function ChColorOver(id)
{
alert("3");
    document.getElementById(id).style.className="menu_down";
    alert("4");
}
function resizeImg(obj, maxw) {
var obj = document.getElementById(obj);
    var imgs = obj.getElementsByTagName('img');
    var imgCount = imgs.length;
    if(imgCount==0) return;
    for(var i=0; i<imgCount; i++) {
        if(imgs[i].width>maxw) {
            var oldw = imgs[i].width;
            var oldh = imgs[i].height;
            imgs[i].style.width = maxw +'px';
            imgs[i].style.height = (maxw/oldw*oldh) +'px';
        }
    }
}

function searchArea(id)
{
   var  ddl=document.getElementById(id);
   var aid=ddl.options[ddl.selectedIndex].value;
   var area=ddl.options[ddl.selectedIndex].text;
   location.href="ShopArea.aspx?aid="+aid+"&area="+area;
}

function Shadow(btn)
{
    btn.className="Shadow";
}
function NoShadow(btn)
{
    btn.className="btnUnit";
}