function init()
{
	var x = document.getElementById('buttons').getElementsByTagName('IMG');
	
	var preloads = new Object();
	for (var i=0;i<x.length;i++)
	{
		preloads['n'+x[i].id] = new Image;
		preloads['n'+x[i].id].src = 'images/'+ x[i].id + '-trans.png';
		preloads['o'+x[i].id] = new Image;
		preloads['o'+x[i].id].src = 'images/'+ x[i].id + '-on-trans.png';
		x[i].onmouseover = function () {this.src=preloads['o'+this.id].src;}
		x[i].onmouseout = function () {this.src=preloads['n'+this.id].src;}
	}
}