function btnswitch()
{
 if (!document.getElementById) return
 var btnb4;
 var btnTmp = new Array();
 var btnArr = document.getElementsByTagName('img');
 for (var i = 0; i < btnArr.length; i++) 
	{
	 if (btnArr[i].getAttribute('btnIn')) 
		{
		 btnTmp[i] = new Image();
		 btnTmp[i].src = btnArr[i].getAttribute('btnIn');
		 btnArr[i].onmouseover = function() 
				{
				 btnb4 = this.getAttribute('src');
				 this.setAttribute('src',this.getAttribute('btnIn'))
				}
		 btnArr[i].onmouseout = function() 
				{
				this.setAttribute('src',btnb4)
				}
		}
	}
}
onload=btnswitch;