var numOfSkin = 3;
function skin() {
var skin = new Array(numOfSkin + 1);
skin[0]="<link rel='stylesheet' type='text/css' href='bobSskin.css'/>" 
skin[1]="<link rel='stylesheet' type='text/css' href='skin.css'/>" 
skin[2]="<link rel='stylesheet' type='text/css' href='stevePskin.css'/>" 
skin[3]="<link rel='stylesheet' type='text/css' href='plushskin.css'/>" 

indxOfSkin = rndIntegerSkin();
strSkin = skin[indxOfSkin];
return strSkin;
} 

function rndIntegerSkin() {
var rndNumber = -1;
while (rndNumber <0 || rndNumber > numOfSkin || isNaN(rndNumber)) {
     rndNumber = parseInt(Math.random() * (numOfSkin + 1));
     }
return rndNumber;
}