var Frame0 = "paginasx.html";
var Frame1 = "home.html";
var str = location.search;
var pos = str.indexOf("&");
if (pos != -1) {
  var num = str.substring(pos + 1, str.length);
  window["Frame" + num] = str.substring(1, pos);
}

document.write(
'<frameset cols="33%,66%" framespacing="0" frameborder="NO" border="0">',
'<frame name="leftFrame" scrolling="No" noresize="noresize" id="leftFrame" src="', Frame0 ,'" />',
'<frame name="mainFrame" id="mainFrame" title="mainFrame" src="', Frame1 ,'" />',
'</frameset>'
);