function Shuffle(){
var div_arr = new Array();
div_arr[0] = "";
div_arr[1] = "";
div_arr[2] = "";
div_arr[3] = "";
div_arr[4] = "";
div_arr[5] = "";
div_arr[6] = "";
div_arr[7] = "";
div_arr[8] = "";
div_arr[9] = "";
div_arr[10] = "";
div_arr[11] = "";
var spacer = ""
var i = 0;
var j = 0;
var random;
var div = document.getElementById('contentDiv');
while (i < div_arr.length){
random = Math.floor(Math.random() * div_arr.length)
if (div_arr[random] != 'selected'){
div.innerHTML += div_arr[random];
if((i+1)%4 == 0)
div.innerHTML += spacer;
div_arr[random] = 'selected';
i++;
}
}
}
