var  s="距2010上海世博会";
var date1= new Date("5/1/2010");
var date2 = new Date();
var date3 = date1.getTime() - date2.getTime();
var date4 = Math.ceil(date3/(1000*60*60*24));
var s = "距2010上海世博会";
if (date4 > 1)
document.write(date4)