var agt = navigator.userAgent.toLowerCase();
var is_ie = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_ie6 = is_ie && /msie (\d)\./.test(agt) && parseInt(RegExp.$1) < 7;
String.prototype.ltrim=function()
{
return this.replace(/^\s+/,"");
}
String.prototype.rtrim=function()
{
return this.replace(/\s+$/,"");
}
String.prototype.trim=function()
{
return this.ltrim().rtrim();
}
function judgeIsNaN(num)
{
if(num=='Infinity'){
