Javascript mask layer and loading effect code_javascript skills

//loading
function showLoad(tipInfo) {
var iWidth = 120; //The width of the pop-up window;
var iHeight = 0; //The height of the pop-up window;
var scrolltop = 0;
var scrollleft = 0;
var cheight = 0 ;
var cwidth = 0;
var eTip = document.createElement('div');
eTip.setAttribute('id', 'tipDiv');
eTip.style.position = ' absolute';
eTip.style.display = 'none';
eTip.style.border = 'solid 0px #D1D1D1';
eTip.style.backgroundColor = '#4B981D';
eTip .style.padding = '5px 15px';
if(document.body.scrollTop){//This is a js compatible
scrollleft=document.body.scrollLeft;
scrolltop=document.body. scrollTop;
cheight=document.body.clientHeight;
cwidth=document.body.clientWidth;
}
else{
scrollleft=document.documentElement.scrollLeft;
scrolltop=document .documentElement.scrollTop;
cheight=document.documentElement.clientHeight;
cwidth=document.documentElement.clientWidth;
}
iHeight = eTip.offsetHeight;
var v_left=(cwidth-iWidth )/2 scrollleft; //
var v_top=(cheight-iHeight)/2 scrolltop;
eTip.style.left = v_left 'px';
eTip.style.top = v_top 'px';
eTip.innerHTML = '　 ' tipInfo '';
try {
document.body.appendChild(eTip);
} catch (e) { }
$("#tipDiv").css( "float", "right");
$("#tipDiv").css("z-index", "99");
$('#tipDiv').show();
ShowMark();
}
function closeLoad() {
$('#tipDiv').hide();
HideMark();
}
//Display mask Gray layer
function ShowMark() {
var xp_mark = document.getElementById("xp_mark");
if (xp_mark != null) {
//Set DIV
xp_mark.style. left = 0 "px";
xp_mark.style.top = 0 "px";
xp_mark.style.position = "absolute";
xp_mark.style.backgroundColor = "#000";
xp_mark.style.zIndex = "1";
if (document.all) {
xp_mark.style.filter = "alpha(opacity=50)";
var Ie_ver = navigator["appVersion" ].substr(22, 1);
if (Ie_ver == 6 || Ie_ver == 5) { hideSelectBoxes(); }
}
else { xp_mark.style.opacity = "0.5"; }
xp_mark.style.width = "100%";
xp_mark.style.height = "100%";
xp_mark.style.display = "block";
}
else {
//Add div explainDiv to the page, note that it must be the first element immediately following the body. Otherwise IE6 will not work properly.
$("body").prepend("");
ShowMark(); //Continue to call back to yourself
}
}
//Hide the gray layer
function HideMark() {
var xp_mark = document.getElementById("xp_mark");
xp_mark.style.display = "none";
var Ie_ver = navigator["appVersion"].substr(22, 1);
if (Ie_ver == 6 || Ie_ver == 5) { showSelectBoxes(); }
}