Left to Right Tab index in Javascript for Dynamics CRM 2013

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Javascript

CRM

I have applied below javascript for left to right tab index in Dynamics CRM 2013 in Web resource , which works for IE but does not work for Chrome and Firefox.

 function TabOrderLefttoRight() {
   for(var i = 0; i < Xrm.Page.ui.controls.getLength(); i++) 
   {  
       var element = Xrm.Page.ui.controls.get(i);
        if (element.tabIndex && element.tabIndex != "0") {
            if (element.className == 'ms-crm-Hidden-NoBehavior') 
                continue;
            if (element.tagName == 'A') {
                if (element.className != 'ms-crm-InlineTabHeaderText') 
                    continue;
            }
           element.tabIndex = 1000 + (i * 10);
        }
    }
}

Please help.

Thank You.