creating div elements dynamically

Please look at the below function. I am having problem in addinjg childelements to the div reference.
I am experiencing problem with savePrintSelect.appendChild(newdiv). Can some one help me to resolve thus issue.

function populatePrintSelect(printSelectArray){
    var savePrintSelect = dialogArguments[0].document.getElementById('popupSavePrintDiv');
     for (index in printSelectArray) {
       var newdiv = document.createElement('div');
       var text = document.createTextNode(printSelectArray[index]);
       var divIdName = 'my'+index+'Div';
       newdiv.setAttribute('id',divIdName);
       newdiv.onmouseover="this.style.backgroundColor='#000000'; this.style.color='#FFFFFF'";
       newdiv.onmouseout="this.style.backgroundColor='#F5F5F5'; this.style.color='#000000'";
       //newdiv.innerHTML = printSelectArray[index];
       newdiv.appendChild(text);
       savePrintSelect.appendChild(newdiv)
     }
   
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