Solicito ayuda con html!

Tienes que meter este script en el HEAD
<SCRIPT LANGUAGE="JavaScript">
// browser test:
browserName = navigator.appName;
browserVer = parseInt(navigator.appVersion);
if (browserName == "Netscape" && browserVer >= 4 || browserName ==
"Microsoft Internet Explorer" && browserVer >= 4)
version = "1";
else if (browserName == "Netscape" && browserVer >= 3)
version = "2";
else
version = "3";
if (version == "1") {
var correctwidth=800
var correctheight=600
if (screen.width<correctwidth||screen.height<correctheight)
location="PAGE_FOR_LOW_SIZE.htm"
else
location="PAGE_FOR_HIGH_SIZE.htm"
}
if (version == "2") {
var toolkit = java.awt.Toolkit.getDefaultToolkit();
var screen_size = toolkit.getScreenSize();
var correctwidth=800
var correctheight=600
if (screen_size.width<correctwidth||screen_size.height<correctheight)
location="PAGE_FOR_LOW_SIZE.htm"
else
location="PAGE_FOR_HIGH_SIZE.htm"
}
if (version == "3")
location="DEFAULT_PAGE.htm"
</SCRIPT>
Luego tendras que retocar el codigo con tus nombres de paginas.
Si la resolucion es menor de 800x600 tendras una pagina, y su nombre debe ir donde pone PAGE_FOR_LOW_SIZE.htm
Si es mayor o igual...PAGE_FOR_HIGH_SIZE.htm
Tienes que poner unicamente los nombres de tus paginas.