iPath = 'http://www.jurconsult.ru/images/logos/';
iExt = '.gif';

function preLoad() {
	if(document.images) {
		var argLen = arguments.length;
		for(var i = 0; i < argLen; i++) {
			var arg = arguments[i];
			self[arg] = new Image();
			self[arg].src = iPath + arg + '_off' + iExt;
		}
	}
}

function rollOver(iName) {
	if(document.images) {
		iName.src = iPath + iName.name + '_on' + iExt;
	}
}

function rollOut(iName) {
	iName.src = iPath + iName.name + '_off' + iExt;
}