function openwindow(url,ancho,alto) {
	propiedades = "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=" + ancho + ",height=" + alto ;
	mywin = window.open(url,"win",propiedades);
	mywin.self.focus();
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}
function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
 var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
   var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
   if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

<!----------ABRE VENTANA------------------->
function AbreVentana(URL,Ancho,Alto,scroll)
{
	//alert (Ancho);
	w = window.open(URL,"","scrollbars="+ scroll + ",height="+ Alto +",width="+ Ancho +",resizable=yes,left=0,top=0");
	w.self.focus();
}

function test_contacto(theForm)	{
	auxInt = 0;
	cad = "Por favor compruebe haber rellenado los siguientes campos:\r\n";
	
	if(theForm.nombre.value == "")	{
		auxInt = 1;
		cad = cad + "\t* Nombre\n";
	}		
	if(theForm.apellidos.value == "")	{
		auxInt = 1;
		cad = cad + "\t* Apellidos\n";
	}
	if(theForm.email.value == "")	{
		auxInt = 1;
		cad = cad + "\t* Correo electrónico\n";
	}
	if(theForm.comentarios.value == "")	{
		auxInt = 1;
		cad = cad + "\t* Comentarios\n";
	}
	if(auxInt == 0)	
		theForm.submit();
	else
		alert(cad);
}