// zoom_ratio():
// will set $_SESSION['zoom_ratio'] based on setting real width to min_w

function zoom_ratio(min_w, file){
	var w = document.body.clientWidth;
	var ratio = 1.0;
	
	ratio = parseFloat(w / min_w) * 100;
	ratio = Math.floor(ratio) / 100;
	
	file = file + "&zoom_ratio=" + ratio;
	ajax_simple(file, 'zoom_ratio');
}