bgImg= new Array();
bgImg[0]="image/icon/SUPRO_top.gif";
bgImg[1]="image/icon/S_W_top.gif";
bgImg[2]="image/icon/EYE.gif";
bgImg[3]="image/icon/DELTA.gif";
bgImg[4]="image/icon/cell.gif";
bgImg[5]="image/icon/national.gif";
bgImg[6]="image/icon/Tuning_fork.gif";
function bgImgRND(){
if (document.getElementById){
n=Math.floor(Math.random()*bgImg.length);
document.getElementById("tb1").style.backgroundImage="url("+bgImg[n]+")";
}
}