// xplat API to move Y pos function moveElementTop (elementName, amount) { var range = "" // empty for Nav4 var styleObj = "" // ditto var topName = "top" // "top" in Nav4 if (isIE4) { range = ".all" styleObj = ".style" topName = "pixelTop" } eval("document" + range + "." + elementName + styleObj + topName + " += " + amount) }