function openwindow(winurl,winname,winparams)
	{
		window.open(winurl,winname,winparams).focus();
	}
	
	function turnOn(imageName) {
		if (document.images) {
			document.images[imageName].src = eval(imageName + '_on.src');
		}
	}

	function turnOff(imageName) {
		if (document.images) {
			document.images[imageName].src = eval(imageName + '.src');
		}
	}			
	
	function swapImage(imageName, path) {
		if (document.images) {
			document.images[imageName].src = path;
		}
	}