function jszj()
{
var i,nprice,tolprice;
var days = parseInt(document.frm2.yu_tianshu.options[document.frm2.yu_tianshu.selectedIndex].value);
var zuidi = parseInt(document.frm2.zuidi.value);
var zuigao = parseInt(document.frm2.zuigao.value);
if(days==30)	{
msgcount = zuidi*days/30;
}
if(days<30)
{
nprice=zuigao
msgcount=nprice
	for (i=2;i<days+1;i++)
	{
	nprice=nprice*(1-2/100);
	msgcount = msgcount+nprice;
	}
}
alert("Hello! You will live "+days+"days. The price is US$"+Math.ceil(msgcount/days)+" per day. Total rentals is US$"+Math.ceil(msgcount/days)*days+". Thanks");
}