var agt=navigator.userAgent.toLowerCase();
var is_ie=(agt.indexOf("msie")!=-1 && document.all);
var is_ie5 = (agt.indexOf("msie 5") != -1 && document.all);
var is_opera = (agt.indexOf("opera") != -1);
var is_mac = (agt.indexOf("mac") != -1);
var is_gecko = (agt.indexOf("gecko") != -1);
var is_safari = (agt.indexOf("safari") != -1);

String.prototype.padLeft=function(len,character)
{
	if(this=="")return null; 
	if(isNaN(len))return null;
	if(character)
	{
		if(character.length>1)
			character=character.substr(0,1);
	}
	else
		character=" ";
	var strNum=this;
	while(strNum.length<len)
		strNum=character+strNum;
	return strNum;
}

Number.prototype.padLeft=function(len,character)
{
	if(isNaN(this))return null; 
	if(isNaN(len))return null;
	if(character)
	{
		if(character.length>1)
			character=character.substr(0,1);
	}
	else
		character=" ";
	var strNum=""+this;
	while(strNum.length<len)
		strNum=character+strNum;
	return strNum;
}