代码:

function wsug(e, str){ // http://www.hansir.cn
    var oThis = arguments.callee;
    if(!str) {
        oThis.sug.style.visibility = 'hidden';
        document.onmousemove = null;
        return;
    }        
    if(!oThis.sug){
        var div = document.createElement('div'), css = 'top:0; left:0; position:absolute; z-index:100; visibility:hidden';
            div.style.cssText = css;
            div.setAttribute('style',css);
        var sug = document.createElement('div'), css= 'font:normal 12px/16px "宋体"; white-space:nowrap; color:#666; padding:3px; position:absolute; left:0; top:0; z-index:10; background:#f9fdfd; border:1px solid #0aa';
            sug.style.cssText = css;
            sug.setAttribute('style',css);
        var dr = document.createElement('div'), css = 'position:absolute; top:3px; left:3px; background:#333; filter:alpha(opacity=50); opacity:0.5; z-index:9';
            dr.style.cssText = css;
            dr.setAttribute('style',css);
        var ifr = document.createElement('iframe'), css='position:absolute; left:0; top:0; z-index:8; filter:alpha(opacity=0); opacity:0';
            ifr.style.cssText = css;
            ifr.setAttribute('style',css);
        div.appendChild(ifr);
        div.appendChild(dr);
        div.appendChild(sug);
        div.sug = sug;
        document.body.appendChild(div);
        oThis.sug = div;
        oThis.dr = dr;
        oThis.ifr = ifr;
        div = dr = ifr = sug = null;
    }
    var e = e || window.event, obj = oThis.sug, dr = oThis.dr, ifr = oThis.ifr;
    obj.sug.innerHTML = str;
    
    var w = obj.sug.offsetWidth, h = obj.sug.offsetHeight, dw = document.documentElement.clientWidth||document.body.clientWidth; dh = document.documentElement.clientHeight || document.body.clientHeight;
    var st = document.documentElement.scrollTop || document.body.scrollTop, sl = document.documentElement.scrollLeft || document.body.scrollLeft;
    var left = e.clientX +sl +17 + w < dw + sl && e.clientX + sl + 15 || e.clientX +sl-8 - w, top = e.clientY + st +17 + h < dh + st && e.clientY + st + 17 || e.clientY + st - 5 - h;
    obj.style.left = left+ 10 + 'px';
    obj.style.top = top + 10 + 'px';
    dr.style.width = w + 'px';
    dr.style.height = h + 'px';
    ifr.style.width = w + 3 + 'px';
&nb