var howOften = 5; //number often in seconds to rotate
var current = 0; //start the counter at 0
var ns6 = document.getElementById&&!document.all; //detect netscape 6

var items = new Array();
    items[0]="<img src='images/rotate1_br.jpg' width='225px' height='168px' border='0' alt='Building renovations'>";
    items[1]="<img src='images/rotate2_br.jpg' width='225px' height='168px' border='0' alt='Building renovations'>";
    items[2]="<img src='images/rotate3_br.jpg' width='225px' height='168px' border='0' alt='Building renovations'>";
    items[3]="<img src='images/rotate4_br.jpg' width='225px' height='168px' border='0' alt='Building renovations'>";

function rotater() {
    document.getElementById("placeholder").innerHTML = items[current];
    current = (current==items.length-1) ? 0 : current + 1;
    setTimeout("rotater()",howOften*1000);
}
window.onload=rotater;