//Gets URL from referrer and extracts the keywords
		function urlKeywordSearch() {
			var referrerStr = document.referrer;
			//Crop out our keywords
			//var referrerStr = "http://www.google.com.au/search?q=digital+string&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a";
			
			var startCrop = referrerStr.indexOf("search?q=");
			var endCrop = referrerStr.indexOf("&");
			if ((startCrop == "-1") || (endCrop == "-1")) {
				//alert("No keywords found");
				var referrerStr = "";
				document.getElementById('footer-keyword').style.display = "none";
			}

			startCrop = startCrop + 9;
			var keywordStr = referrerStr.substring(startCrop, endCrop);
			
			//Remove non-alpha characters execpt +
			var cleanKeywordStr = StripChars(keywordStr);
			
			//Extract keywords
			var keywords = new Array();
			keywords = cleanKeywordStr.split('+');
			var message = "Words you searched in Google:\n";
			for (var index in keywords) {
				//message = message + keywords[index] + '\n';
				if (keywords[index] == "digital") {
					document.getElementById('footer-keyword').style.display = "inline";
				}
			}
		}
		
		
		//http://www.netmechanic.com/news/vol4/javascript_no14.htm
		function StripChars(Input) {
    	var Output=""
    
	    for (a=0; a<Input.length; a++) {
	        var Char = Input.charAt(a).toLowerCase()    
	        if ((Char == "+") || (Char>="a" && Char<="z")){
	         Output+=Input.charAt(a)
	        }
	    }
	    return Output
		}