function preloader(){
     // create object
     imageObj = new Image();

     // set image list
     imagess = new Array();
     imagess[0]="i/bwrollovers/01_vickery.jpg"
     imagess[1]="i/bwrollovers/02_vickery.jpg"
     imagess[2]="i/bwrollovers/03_founders.jpg"
     imagess[3]="i/bwrollovers/04_bricks.jpg"
     imagess[4]="i/bwrollovers/05_founders.jpg"
     imagess[5]="i/bwrollovers/06_bricks.jpg"
     imagess[6]="i/bwrollovers/07_bricks.jpg"
     imagess[7]="i/bwrollovers/08_vickery.jpg"

     // start preloading
     for(i=0; i<=7; i++){
        imageObj.src=imagess[i];
     }     
}

function rollover(what, whichi){
	oldsource = what.src;
	what.src = imagess[whichi];
	what.onmouseout = function(){
		what.src = oldsource;
	}
}

window.onload = preloader;