String.Format

function _StringFormatInline()
{
	var txt = this;
	for(var i=0;i<arguments.length;i++)
	{
		var exp = new RegExp('\\{' + (i) + '\\}','gm');
		txt = txt.replace(exp,arguments[i]);
	}
	return txt;
}
 
function _StringFormatStatic()
{
	for(var i=1;i<arguments.length;i++)
	{
		var exp = new RegExp('\\{' + (i-1) + '\\}','gm');
		arguments[0] = arguments[0].replace(exp,arguments[i]);
	}
	return arguments[0];
}
 
if(!String.prototype.format)
{
	String.prototype.format = _StringFormatInline;
}
 
if(!String.format)
{
	String.format = _StringFormatStatic;
}
 
//Static
var str = String.format("This is a {0} string using the {1} method.","formatted","static");
 
//Inline
var str = "This is a {0} string using the {1} method.".format("formatted","inline");