// preloadImg(imgObjName, imgURL)
//   preload all rollover images into browser cache
//   imgObjName - name of Image object
//   imgURL - URL (absolute or relative) of image file
//
// displayImg(imgObjName, imgTagName)
//   display imgObjName image in imgTagName <IMG> tag
//   imgObjName - name of Image object
//   imgTagName - NAME attribute of <IMG> tag

// load imgURL into browser's cache
function preloadImg(imgObjName, imgURL)
{
    if (document.images)
    {
		eval(imgObjName + " = new Image()");
		eval(imgObjName + ".src = imgURL");
	}
}

// disp imgObjName in imgTagName
function displayImg(imgObjName, imgTagName)
{
	if (document.images)
    {
		document[imgTagName].src = eval(imgObjName + ".src");
	}
}