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我想在我的javascript messagebox函数中添加一个链接.有没有办法做到这一点？

TodayDate = new Date();
if (sender._selectedDate < new Date(TodayDate.getYear(), TodayDate.getMonth()-1, 1)) 
{
alert("Only current and previous months active.\n\nPlease visit\n
Agency ...HOMEPAGE...\nfor Archive Commissions");
sender._selectedDate = new Date();
}