Yesterday I tested screen.width/height and related properties in the mobile browsers. The conclusion is that screen.width/height is completely unreliable.
screen.width is useless - QuirksBlog

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Yesterday I tested screen.width/height and related properties in the mobile browsers. The conclusion is that screen.width/height is completely unreliable.
screen.width is useless - QuirksBlog

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An oldie, but a useful reference
Some nice JS cookie functions you can copy paste into your work, and an in-depth explanation.
Might be handy to wrap your create in an escape() and your read in an unescape(). E.g. Where these lines are written, add the escape / unescape functions
document.cookie = name+"="+ escape(value) +expires+"; path=/";
if (c.indexOf(nameEQ) == 0) return unescape(c.substring(nameEQ.length,c.length));
Comment interdire le mode de Compatibilité sur IE ? http://ow.ly/anwdJ WebDesign : QuirksMode / Alsacreations