How to disable HTML attribute using JAVASCRIPT

Below JavaScript can be used to disable HTML Attributes during run time. (Eg: TextBox, Select Box, Check Box, Radio Button, Etc)

<script>
window.onload= function()
{
          DisableEnableForm(document.frmwitness,true);
 }

function DisableEnableForm(xForm,xHow){
  objElems = xForm.elements;
  for(i=0;i
  {
       var ck = objElems[i].type;
       if(ck=="select-one" || ck=="text")
      {
          objElems[i].disabled = xHow;
       }
   }
}
</script>

Note: You can call above function as per requirement.