//文本框操作
function OnEnter(field) { if (field.value == field.defaultValue) { field.value = ""; field.className="keyword2"} }
function OnExit(field) { if (field.value == "") { field.value = field.defaultValue; field.className="keyword"} }
//搜索按钮
function search_btn_onclick() {
    var str = document.getElementById("keyword");
    if (str!=null) {
        window.location.href = "http://about.58.com/v5/SearchResult.aspx?strSearch=" + escape(str.value);
    }
}
//搜索框事件
function enterSubmit(src, e) {
    if (window.event)
        keyPressed = window.event.keyCode; // IE
    else
        keyPressed = e.which; // Firefox
    if (keyPressed == 13) {
        submitForm();
        return false;
    }
}
function submitForm() {
    var obj = document.getElementById('searchbtn');
    obj.click();
}