The following function implements a control ID that lists all HTML controls on the page of type text

        function Texts()
        {
             //var els= document.getElementsByTagName("*");   //els Gets all the controls for the page
             var els= document.getElementsByTagName("INPUT"); //The top one is also ok, so you can reduce the loop
             var msgs="";
             for (var i=0;i<els.length;i++ ) 
             {
                 if (els[i].type == "text" ) 
                 {
                     //Get control ID
                     msgs += els[i].id + ",";
                 }
             }
             alert(msgs);
         }