// JavaScript Document
function tog()
			{
				var currentStyle = $("#stylesheet").attr("href");
						if (currentStyle == "css/style_purple.css") 
						{
							$("#stylesheet").attr({href : "css/style_green.css"});
							currentStyle = "css/style_green.css";
						} else if (currentStyle == "css/style_green.css")
						{
							currentStyle = $("#stylesheet").attr({href : "css/style_orange.css"});
							currentStyle = "css/style_orange.css";
						} 
						else if (currentStyle == "css/style_orange.css") 
						{
							currentStyle = $("#stylesheet").attr({href : "css/style_red.css"});
							currentStyle = "css/style_red.css";
						}
						else if (currentStyle == "css/style_purple.css") 
						{  
							currentStyle = $("#stylesheet").attr({href : "css/style_red.css"});
							currentStyle = "css/style_red.css";
						}
						else if (currentStyle == "css/style_red.css") 
						{  
							currentStyle = $("#stylesheet").attr({href : "css/style_blue.css"});
							currentStyle = "css/style_blue.css";
						}
						else
						{
							currentStyle = $("#stylesheet").attr({href : "css/style_purple.css"});
							currentStyle = "css/style_purple.css";
						}
			}