//CONSTANTS for page navigtion
    var homePageUrl = 'home.php';
    var aboutPageUrl = 'about.php';
    var deliveryPageUrl = 'delivery.php';
    var productsPageUrl = 'products.php';
    var customerServicePageUrl = 'customerService.php';
    var contactUsPageUrl = 'contact.php';
    var msdsPageUrl='msds.php';
     var infoRequestPageUrl='info_request.php';

    function loadNavDiv(divToShow){
        var divs=document.getElementById('topbarDiv').getElementsByTagName('div');
        for(var i=0;i<divs.length;i++){
           var divId = divs[i].id
           if(divId != null && divId !="undefined" && divId.substring(0,3) == "nav"){
               if(divId == divToShow){
                  divs[i].style.visibility="visible";
               }else{
                  divs[i].style.visibility="hidden";
               }
           }
         }

    }
    function navigate(page){

        navigate(page,false);

    }
    function navigate(page,forceRefresh){

        document.getElementById('contentFrame').src=page;
        if(forceRefresh){//force a refresh if params
            document.getElementById('contentFrame').src =  document.getElementById('contentFrame').src;
        }
        iFrameSize();

    }
    function iFrameSize() {

 //       var iframeEl = window.document.getElementById? window.document.getElementById('contentFrame'): document.all? document.all['contentFrame']: null;
        if(document.getElementById && !(document.all)) {
             var h = document.getElementById('contentFrame').contentDocument.body.scrollHeight;
             document.getElementById('contentFrame').style.height =  h + 'px';
             document.getElementById('contentFrame').style.width = '931px';
        }
         else if(document.all) {
             var iframeEl = window.document.getElementById? window.document.getElementById('contentFrame'): document.all? document.all['contentFrame']: null;
             var h = getDocHeight(window.frames('contentFrame').document);
             iframeEl.style.height = h  + 'px';
             iframeEl.style.width = '931px';
        }
    }
    function getDocHeight(doc)
    {
      var docHt = 0, sh, oh;
      if (doc.height)
      {
        docHt = doc.height;
      }
      else if (doc.body)
      {
        if (doc.body.scrollHeight) docHt = sh = doc.body.scrollHeight;
        if (doc.body.offsetHeight) docHt = oh = doc.body.offsetHeight;
        if (sh && oh) docHt = Math.max(sh, oh);
      }
      return docHt;
    }