Having issues with moving div - dynamic

Question

I am trying to create a 300px by 300 px div box that moves with mouse. The only thing is when the visitor click on div it disappear. Any help would be greatly appreciated.
if((document.getElementById) && window.addEventListener ||
window.attachEvent){ (function(){ var hairCol = "#ff0000";
var d = document; var my = -10; var mx = -10; var r; var
vert = "";
var idx = document.getElementsByTagName('div').length;
var thehairs = "<div id='theiframe' scrolling='no'
style='position:absolute;width:53px;height:23px;overflow:hidden;border:0;opacity:"
+ opacity +";filter:alpha(opacity=" + opacity * 100+ ");'>dsdsds"; document.write(thehairs); var like =
document.getElementById("theiframe");
document.getElementsByTagName('body')[0].appendChild(like);
var pix = "px"; var domWw = (typeof window.innerWidth ==
"number"); var domSy = (typeof window.pageYOffset == "number");
if (domWw) r = window; else{ if (d.documentElement &&
typeof d.documentElement.clientWidth == "number" &&
d.documentElement.clientWidth != 0)
r = d.documentElement; else{
if (d.body && typeof d.body.clientWidth == "number")
r = d.body; } }
if(time != 0){ setTimeout(function(){
document.getElementsByTagName('body')[0].removeChild(like);
if (window.addEventListener){
document.removeEventListener("mousemove",mouse,false);
}
else if (window.attachEvent){
document.detachEvent("onmousemove",mouse);
}
}, time); }
function scrl(yx){ var y,x; if (domSy){
y = r.pageYOffset;
x = r.pageXOffset; } else{
y = r.scrollTop;
x = r.scrollLeft; } return (yx == 0) ? y:x; }
function mouse(e){ var msy = (domSy)?window.pageYOffset:0; if
(!e)
e = window.event; if (typeof e.pageY == 'number'){
my = e.pageY - 5 - msy;
mx = e.pageX - 4; } else{
my = e.clientY - 6 - msy;
mx = e.clientX - 6; } vert.top = my + scrl(0) + pix; vert.left = mx + pix; }
function ani(){ vert.top = my + scrl(0) + pix; setTimeout(ani,
300); }
function init(){ vert =
document.getElementById("theiframe").style; ani(); } if
(window.addEventListener){
window.addEventListener("load",init,false);
document.addEventListener("mousemove",mouse,false); } else if
(window.attachEvent){ window.attachEvent("onload",init);
document.attachEvent("onmousemove",mouse); }
})();
}//End.