var x = 0;

	var xMax = 10;

	

	var scrollSpeed = 50;

	var scrollIncrements = 5;

	var scrollDecrements = -5;

	

	var scrollUpDelay;

	var scrollDownDelay;	

	

	

	function scrollUp() {		

		if(x>=xMax){

			x = 0;

			clearTimeout(scrollUpDelay);

		}

		else{

    		scrollUpDelay = setTimeout('scrollUp()',scrollSpeed); // scrolls every 20 milliseconds							

	    	window.scrollBy(0,scrollDecrements); // horizontal and vertical scroll increments					

		}

		x++;		

	}

	

	function scrollDown() {

		if(x>=xMax){

			x = 0;

			clearTimeout(scrollDownDelay);

		}

		else{

    		scrollDownDelay = setTimeout('scrollDown()',scrollSpeed); // scrolls every 20 milliseconds							

	    	window.scrollBy(0,scrollIncrements); // horizontal and vertical scroll increments					

		}

		x++;

	}