// number columns
		var last_1 = 0;
		var last_2 = 0;
		var last_3 = 0;
		var last_4 = 0;
		var last_5 = 0;
		var last_6 = 0;

		// shortcut
		function gE(id) {
			return document.getElementById(id);
		}

		/**
		* Return random color for a column
		* @return Array
		*/
		function getColor() {
			colors = new Array(
				'red',
				'blue',
				'green',
				'orange'
			);
			
			rnd = getRandom(0, colors.length);
			return colors[rnd];
		}

		/**
		* Update the clock
		*/
		function updateClock() {
			tm = new Date();
			hours = tm.getHours().toString();
			minutes = tm.getMinutes().toString();
			secondes = tm.getSeconds().toString();

			if (hours.length > 1) {
				first = hours.substring(0, 1);
				second = hours.substring(1, 2);
			} else {
				first = 0;
				second = hours;
			}
			
			if (minutes.length > 1) {
				third = minutes.substring(0, 1);
				fourth = minutes.substring(1, 2);
			} else {
				third = 0;
				fourth = minutes;
			}

			if (secondes.length > 1) {
				fifth = secondes.substring(0, 1);
				sixt = secondes.substring(1, 2);
			} else {
				fifth = 0;
				sixt = secondes;
			}

			updateNumber(1, first, 3);
			updateNumber(2, second, 9);
			updateNumber(3, third, 6);
			updateNumber(4, fourth, 9);
			updateNumber(5, fifth, 6);
			updateNumber(6, sixt, 9);
			
			setTimeout('updateClock()', 1000);
		}

		/**
		* Update one column and set the correct number of blocks
		*
		* @param String column identifier
		* @param Integer number to set the number of blocks to
		* @param Integer max number of blocks in the column
		* @param String columncolor
		*/
		function updateNumber(id, cijfer, max, kl) {
			var lid = 'last_' + id.toString();

			if (eval(lid) == cijfer) {
				return;
			}

			// clear number first
			for (var i = 0; i < max; ++i) {
				var nid = id.toString() + '_' + i;
				var cel = gE(nid);		
				cel.style.backgroundColor = 'white';
			}

			// get new color
			var kl = getColor();

			var range = new Array();

			if (cijfer > 0)
				range = getRandomRange(0, max, cijfer);

			for (var i = 0; i < range.length; i++) {
				var nid = id.toString() + '_' + range[i].toString();
				var cel = gE(nid);		
				cel.style.backgroundColor = kl;

				// set and update last set number
				eval(lid + '= ' + cijfer);
			}

		}

		/**
		* Get a random number between a lowest and highest value
		* 
		* @param Integer lowest number
		* @param Integer highest number
		*/
		function getRandom(low, high) {
			var high, low;
			return Math.floor(Math.random() * high) + low;
		}

		/**
		* Get a list of random numbers
		*
		* @param Integer lowest number
		* @param Integer highest number
		* @param Integer number of random numbers to return
		*/
		function getRandomRange(low, high, number) {
			var low, high, number;
			var range = new Array();

			// check
			if ((high - low) < number)
				return false;

			var i = 0;
			while (i < (number)) {
				rn = getRandom(low, high);

				if (range.in_array(rn))
					continue;

				range[i] = rn;
				++i;
			}

			return range;
		}

		/**
		* in_array -- Checks if a value exists in an array
		*
		* Searches haystack for needle and returns TRUE if it is found in the array, FALSE otherwise. 
		* If the third parameter strict is set to TRUE then the in_array() function will also check the types of the needle in the haystack. 
		* Note: If needle is a string, the comparison is done in a case-sensitive manner. 
		* 
		* @param mixed needle
		* @param Array haystack
		* @param Boolean strict false
		* @author Mick <mick@vandermostvanspijk.nl>
		* @copyright LGPL
		* @todo make needle so that it might be an array
		* @todo make strict working
		*/
		function in_array(needle, haystack, strict) {
			var needle = needle;
			var haystack = haystack;
			var strict = strict || false;

			for (var i = 0; i < haystack.length; i++) {
				if (haystack[i] == needle) {
					return true;
				}
			}

			return false;
		}

		// add to array class
		function inArray(needle, strict) {
			return in_array(needle, this, strict);
		}
		Array.prototype.in_array = inArray;

		// page loader
		function load() {
			 updateClock();
		}

		// register event
		window.onload = load;