var imarr = new Array()
var imcnt=0
function loadimg(iname,istop,imove)
{
	imarr[imcnt]=new Array(3)
	imarr[imcnt][0]=iname
	imarr[imcnt][1]=new Image()
	imarr[imcnt][1].src=istop
	imarr[imcnt][2]=new Image()
	imarr[imcnt][2].src=imove
	imcnt++
}

function imgoff()
{
	for(var tt=0;tt<imcnt;tt++)
	{
		if(document.images[imarr[tt][0]]!=null)
			document.images[imarr[tt][0]].src=imarr[tt][1].src
	}
}

function imgon(iname)
{
	for(var tt=0;tt<imcnt;tt++)
	{
		if(document.images[imarr[tt][0]]!=null)
			if(iname!=imarr[tt][0])
				document.images[imarr[tt][0]].src=imarr[tt][1].src
			else
				document.images[imarr[tt][0]].src=imarr[tt][2].src
			
	}
}

loadimg("a","images/1.gif","images/1_2.gif")
loadimg("b","images/2.gif","images/2_2.gif")
loadimg("c","images/3.gif","images/3_2.gif")
loadimg("d","images/4.gif","images/4_2.gif")