Check if mobile

mobiletest.js

var sw = document.body.clientWidth,
		sh = document.body.clientHeight,
		breakpoint = 650,
		mobile = true;
		
$(document).ready(function() {
	checkMobile();
});
	
$(w).resize(function(){
	sw = document.body.clientWidth;
	sh = document.body.clientHeight;
	checkMobile();
});

function checkMobile() {
	mobile = (sw > breakpoint) ? false : true;
	if (!mobile) {
		// if not mobile
	} else { 
		// or else...
	}
}