window.onload = init ;

function init()
{
  for(var i in document.forms)
    document.forms[i].onsubmit = disableButton ;
} 

function disableButton()
{
  document.body.style.cursor = 'wait' ;
  for(var i in this.elements)
    if(this.elements[i].type == "submit")
      this.elements[i].onclick = ignore ;
}

function ignore()
{
  return false ;
}