//关闭等待窗口

 function closediv() {

     //Close Div

     document.body.removeChild(document.getElementById("bgDiv"));

     document.getElementById("msgDiv").removeChild(document.getElementById("msgTitle"));

     document.body.removeChild(document.getElementById("msgDiv"));

 }

 //显示等待窗口

 function showdiv(str) {

     var msgw, msgh, bordercolor;

     msgw = 400; //提示窗口的宽度

     msgh = 100; //提示窗口的高度

     bordercolor = "#336699"; //提示窗口的边框颜色

     titlecolor = "#99CCFF"; //提示窗口的标题颜色   

     var sWidth, sHeight;

     sWidth = window.screen.availWidth;

     sHeight = window.screen.availHeight;  

     var bgObj = document.createElement("div");

     bgObj.setAttribute('id', 'bgDiv');

     bgObj.style.position = "absolute";

     bgObj.style.top = "0";

     bgObj.style.background = "#777";

     bgObj.style.filter = "progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";

     bgObj.style.opacity = "0.6";

     bgObj.style.left = "0";

     bgObj.style.width = sWidth + "px";

     bgObj.style.height = sHeight + "px";

     document.body.appendChild(bgObj);

     var msgObj = document.createElement("div")

     msgObj.setAttribute("id", "msgDiv");

     msgObj.setAttribute("align", "center");

     msgObj.style.position = "absolute";

     msgObj.style.background = "white";

     msgObj.style.font = "12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";

     msgObj.style.border = "1px solid " + bordercolor;

     msgObj.style.width = msgw + "px";

     msgObj.style.height = msgh + "px";

     msgObj.style.top = (document.documentElement.scrollTop + (sHeight - msgh) / 2) + "px";

     msgObj.style.left = (sWidth - msgw) / 2 + "px";

     var title = document.createElement("h4");

     title.setAttribute("id", "msgTitle");

     title.setAttribute("align", "right");

     title.style.margin = "0";

     title.style.padding = "3px";

     title.style.background = bordercolor;

     title.style.filter = "progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";

     title.style.opacity = "0.75";

     title.style.border = "1px solid " + bordercolor;

     title.style.height = "18px";

     title.style.font = "12px Verdana, Geneva, Arial, Helvetica, sans-serif";

     title.style.color = "white";

     //title.style.cursor = "pointer";

     //title.innerHTML = "关闭";

     //title.onclick = closediv;

     document.body.appendChild(msgObj);

     document.getElementById("msgDiv").appendChild(title);

     var txt = document.createElement("p");

     txt.style.margin = "1em 0"

     txt.setAttribute("id", "msgTxt");

     txt.innerHTML = str;

     document.getElementById("msgDiv").appendChild(txt);

 }

 //屏蔽F5

 document.onkeydown = mykeydown;

 function mykeydown() {

     if (event.keyCode == 116) //屏蔽F5刷新键

     {

         window.event.keyCode = 0;

         return false;

     }

 }