Use these bookmarklets, or copy/paste the code that follows.

Portrait
Landscape

Portrait

window.orientation = 0;
var e = document.createEvent("Events");
e.initEvent("orientationchange",true,true);
window.dispatchEvent(e)

Landscape

window.orientation=90;
var e=document.createEvent("Events");
e.initEvent("orientationchange",true,true);
window.dispatchEvent(e)

'' == '0'          // false
0 == ''            // true
0 == '0'           // true

false == 'false'   // false
false == '0'       // true

false == undefined // false
false == null      // false
null == undefined  // true

' \t\r\n ' == 0    // true

http://code.google.com/p/google-caja/wiki/AttackVectors