<script>
var _width = parseInt(window.screen.width);
var scale = _width/640;
var ua = navigator.userAgent.toLowerCase();
var result = /android (\d+\.\d+)/.exec(ua);
if (result){var version = parseFloat(result[1]);
	if(version>2.3){
		document.write('<meta name="viewport" content="width=640, minimum-scale = '+scale+', maximum-scale = '+scale+', target-densitydpi=device-dpi">');
	}else{
		document.write('<meta name="viewport" content="width=640, target-densitydpi=device-dpi">');}
	} 
else{
	document.write('<meta name="viewport" content="width=640, user-scalable=no, target-densitydpi=device-dpi">');
}
</script>