String.prototype.format = function()
	{
		var str = this;
		for(var i=0;i<arguments.length;i++)
		{
			var re = new RegExp('\\{' + (i) + '\\}','gm');
			str = str.replace(re, arguments[i]);
		}
		return str;
	}

function toggleVisibility(elementId)
{
	$(elementId).style.visibility = ($(elementId).style.visibility == 'hidden') ? 'visible' : 'hidden';
}