var nTimer=new Array();
var nAlpha=new Array(), nSpeed=10;
var sImgID=new Array(), nNo;

function setCenterImage(sID,n) {
	sImgID[n]=sID;
	nNo=n;
	nAlpha[n]=0;
	document.getElementById(sImgID[n]).style.opacity = 0;
	clearInterval(nTimer[n]);
	nTimer[n] = setInterval("blink()",50);
}

function blink() {

	for(var i=1;i<=5;i++){
		if(nAlpha[i]<100){
			nAlpha[i]+=nSpeed;
			document.getElementById(sImgID[i]).style.opacity = (nAlpha[i]/100);
			document.getElementById(sImgID[i]).style.filter = 'alpha(opacity='+nAlpha[i]+')';
		}
	}

	if(nAlpha[1]==100)
		clearInterval(nTimer[1]);
	if(nAlpha[2]==100)
		clearInterval(nTimer[2]);
	if(nAlpha[3]==100)
		clearInterval(nTimer[3]);
	if(nAlpha[4]==100)
		clearInterval(nTimer[4]);
	if(nAlpha[5]==100)
		clearInterval(nTimer[5]);
}