function centerit(which, i) { 

var which2 = which+i; 

if (document.getElementById(which2)) { 
document.getElementById(which2).style.marginTop = Math.floor((document.getElementById(which2).parentNode.offsetHeight - document.getElementById(which2).offsetHeight) / 2 ) + 'px'; 
var newi = i + 1; centerit(which, newi); 
} 
} 
setTimeout("centerit('centered', 1)", 1);