function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

var i=0;
function varypic(){
	if(!document.getElementById) return false;
	if(!document.getElementById("varyPic")) return false;	
	var varyPic = document.getElementById("varyPic")
	var picArray = varyPic.getElementsByTagName("a");
	if(i==picArray.length){i=0;} 		
	displayVary(i);
	i++;
	varyTime = setTimeout("varypic()",6000);}

function displayVary(tag){
	var picArray = document.getElementById("varyPic").getElementsByTagName("a");	
	for(a=0;a<picArray.length;a++){
		picArray[a].style.display ="none" ;
	}	
	picArray[tag].style.display ="block" ;	
}
addLoadEvent(varypic);