var win = null;

	function trim(cadena)
{
	for(i=0; i<cadena.length; )
	{
		if(cadena.charAt(i)==" ")
			cadena=cadena.substring(i+1, cadena.length);
		else
			break;
	}

	for(i=cadena.length-1; i>=0; i=cadena.length-1)
	{
		if(cadena.charAt(i)==" ")
			cadena=cadena.substring(0,i);
		else
			break;
	}
	
	return cadena;
}

function nuevaventana(mypage,myname,w,h,scroll) 
{ 
  var winl = (screen.width-w)/2;
  var wint = (screen.height-h)/2;
  var settings  ='height='+h+',';
      settings +='width='+w+',';
      settings +='top='+wint+',';
      settings +='left='+winl+',';
      settings +='scrollbars='+scroll+',';
      settings +='resizable=no';
  	  win=window.open(mypage,myname,settings);
  	  if(parseInt(navigator.appVersion) >= 4){win.window.focus();}

	return ( win );

} 

		function validavacio (Ctrl) {
		Ctrl.value = trim(Ctrl.value);
			if (Ctrl.value == "" || Ctrl.value.length == 0)
				return (true);
			else
				return (false);
		}
		
		function cantidadcar (Ctrl) {
		Ctrl.value = trim(Ctrl.value);
				return (Ctrl.value.length);
		}

				
		function validarEmail(valor) {
		  if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(valor)){
		   return (true)
		  } else {
		   return (false);
		  }
		 }