function preload(){

	if(document.images){

		for (var i = 0; i< arguments.length; i++){

			//alert(arguments[i] + '_over');

			self[arguments[i] + '_over'] = new Image();

			self[arguments[i] + '_over'].src = '/images/' + arguments[i] + '_over.gif';

			self[arguments[i] + '_off'] = new Image();

			self[arguments[i] + '_off'].src = '/images/' + arguments[i] + '.gif';

		}

	}

}



function rollover(src, state){

	if (document.images && self[src + '_' + state]){

		document.images[src].src = self[src + '_' + state].src;

	}

}