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;
	}
}