showModelessDialog,如何全屏打开，就是连任务懒也覆盖掉？

<!--
var mode=0
function fullme(e)
{
if(document.all)
{
if(top.document.body.offsetWidth==screen.availWidth)
{
top.moveTo(0,0);
top.resizeTo(screen.availWidth,screen.availHeight);
}
else
{
top.moveBy(e.clientX-e.screenX,e.clientY-e.screenY);
top.resizeBy(screen.availWidth-top.document.body.offsetWidth,screen.availHeight-top.document.body.offsetHeight);
}
}
else
{
alert("请使用IE")
}
}//--><body onload="fullme(event);">