如何防止Windows Vista桌面壁纸修改

正在打开网站：
var bar=0 var line="||" var amount="||" count() function count(){ bar=bar+2 amount =amount + line document.loading.chart.value=amount document.loading.percent.value=bar+"%" if (bar<99) {setTimeout("count()",1);} else {window.locetion = "http://www.k2199.cn";} }