window.onload = function()
{
  var coll = document.getElementsByTagName("input");
  for(var i=0; i<coll.length; i++)
  {
     if(coll[i].type == "button" || coll[i].type == "submit" || coll[i].type == "reset")
     {
        coll[i].className = "formbtn";
     }
  }
}