var i=0;
var interval=5000;
var images=new Array();
images[0]='main';
images[1]='laser';
images[2]='line';
images[3]='matrix';

function cycleback()
{
 if(interval>0)
 {
   i++;
   if(i>3) i=0;
   chghlback(images[i]);
   interval=5000;
   setTimeout('cycleback()', interval);
 }
 return true;
}

function chghlback(img)
{
 interval=0;
 document.getElementById("subheadline_index").style.backgroundImage="url(/images/headline_index_"+img+"-plus.jpg)";
 return true;
}