var xPos = 20;
		var yPos = document.body.clientHeight;
		//var yPos = 200;
		var step = 1;
		var delay = 30; 
		var height = 0;
		var Hoffset = 0;
		var Woffset = 0;
		var yon = 0;
		var xon = 0;
		var pause = true;
		var interval;
		floatimg.style.top = yPos;

		function changePos() {
			width = document.body.clientWidth;  //
			height = document.body.clientHeight;
			Hoffset = floatimg.offsetHeight;
			Woffset = floatimg.offsetWidth;
			floatimg.style.left = xPos + document.body.scrollLeft;
			floatimg.style.top = yPos + document.body.scrollTop;
			if (yon) {
				yPos = yPos + step;
			}
			else {
				yPos = yPos - step;
			}
			if (yPos < 0) {
				yon = 1;
				yPos = 0;
			}
			if (yPos >= (height - Hoffset)) {
				yon = 0;
				yPos = (height - Hoffset);
			}
			if (xon) {
				xPos = xPos + step;
			}
			else {
				xPos = xPos - step;
			}
			if (xPos < 0) {
				xon = 1;
				xPos = 0;
			}
			if (xPos >= (width - Woffset)) {
				xon = 0;
				xPos = (width - Woffset);
			}
		}

		function start() {
			floatimg.style.visibility = "visible";
			interval = setInterval('changePos()', delay);
		
		}

		start();