var newWin;
function abrirVentana(theURL,winName,ancho,alto) {
	if(newWin){
		newWin.close();
	}
	derecha=(screen.width-ancho)/2;
	arriba=(screen.height-alto)/2;
	string="scrollbars=yes,resizable=no,width="+ancho+",height="+alto+",left="+derecha+",top="+arriba+"";
	newWin = window.open(theURL,winName,string);
}

function resizeIframe(iframe) {
	var the_height = iframe.contentWindow.document.body.scrollHeight;
	iframe.height = the_height;
}

function resizeAllIframes() {
	var iframes = document.getElementsByTagName('iframe');
	for (var i = 0; i<iframes.length; i++) {
		resizeIframe(iframes[i]);
	}
}