function detectKey2() {
  if(window.event && window.event.keyCode == 8)
  {
    el = window.event.srcElement;
    if(el.tagName=='TEXTAREA' || el.tagName=='INPUT')
    { return true;} else
    {
      window.event.keyCode = 0;
      return false;
    }
  }
}

function detectKey1() { 
	if(window.event && window.event.keyCode == 8){ 
		window.event.keyCode = 0; return false; 
	} 
} 


function detectKey() {  
  if(window.event && window.event.keyCode == 8)
  {
    el = window.event.srcElement;   
    if(el.tagName=='TEXTAREA' || el.tagName=='INPUT' || editando==1)
    { return true;} else
    {    
      if (editando==0)
      window.event.keyCode = 0;
      return false;
  	  }
  }
  
}

function detectKeyad() {    
  if(window.event && window.event.keyCode == 8)
  {
    el = window.event.srcElement;   
    if(editando==1)
    { return true;} else
    {    
      if (editando==0)
      window.event.keyCode = 0;
      return false;
  	  }
  }
  
}