var cad;
var hoja;
if (screen.height >= 1024) { hoja = "inicial1280x1024"; }
if (screen.height == 900)  { hoja = "inicial1440x900";  }
if (screen.height <= 800)  { hoja = "inicial1280x800";  }

if (navigator.appName == "Microsoft Internet Explorer") { cad = "_ie"; hoja = hoja + cad; }

document.write("<link rel=\"stylesheet\" type=\"text/css\" href=\"" + hoja + ".css\">");