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window.alert = function(txt)
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var shield = document.createElement("DIV");
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shield.style.left = "0px";
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shield.style.height = document.body.scrollHeight+"px";
shield.style.background = "#333";
shield.style.textAlign = "center";
shield.style.zIndex = "10000";
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alertFram.style.textAlign = "center";
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strHtml += " <li style='background:#DD828D;text-align:left;padding-left:20px;font-size:14px;font-weight:bold;height:25px;line-height:25px;border:1px solid #F9CADE;'>[系统提示]</li> ";
strHtml += " <li style='background:#fff;text-align:center;font-size:12px;height:120px;line-height:120px;border-left:1px solid #F9CADE;border-right:1px solid #F9CADE;'>"+txt+"</li> ";
strHtml += " <li style='background:#FDEEF4;text-align:center;font-weight:bold;height:25px;line-height:25px; border:1px solid #F9CADE;'><input type='button' value='确 定' onclick='doOk()' /></li>";
strHtml += "</ul> ";
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