var imgPath = '/images/buttons/';
		var suffix = new Array('over','out');
		
		function preLoad() {
			if(document.images) {
				var argLen = arguments.length;
				for(var i = 0; i < argLen; i++) {
					var arg = arguments[i];
					var sufLen = suffix.length;
					for(j = 0; j < sufLen; j++) {
						var suf = suffix[j];
						self[arg + suf] = new Image();
						self[arg + suf].src = imgPath + arg + '_' + suf + '.gif';
						}
					}
				}
			}
		
		function rollOver(imgName,imgState) {
			if (document.images) {
				document.images[imgName].src = self[imgName + imgState].src;
			}
		}