Detect viewport orientation, if orientation is Portrait display alert message advising user of instructions

by 
if(window.innerHeight > window.innerWidth){
    alert("Please use Landscape!");
}

jQuery Mobile has an event that handles the change of this property… if you want to warn if someone rotates later – orientationchange

Also, after some googling, check out window.orientation (which is I believe measured in degrees…)

EDIT: On mobile devices, if you open a keyboard then the above may fail, so can use screen.availHeight and screen.availWidth, which gives proper height and width even after the keyboard is opened.

if(screen.availHeight > screen.availWidth){
    alert("Please use Landscape!");
}

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