function Search()
{
    var key=document.getElementById("txtkeyword");
    if(key.value!="" && key.value!="请输入产品关键字")
    {
        window.location.href="productsearch.aspx?key="+escape(key.value);
    }
    else
    {
        alert("请输入搜索产品关键字");
    }
}
var W = function(s)
{
	return (typeof s == "object") ? s: document.getElementById(s);
}
function OnEnter( field ) { if( field.value == field.defaultValue ) { field.value = ""; } }
function OnExit( field ) { if( field.value == "" ) { field.value = field.defaultValue; } }