var MPcover = function(){
	var divMPcover = document.createElement('div');
	divMPcover.className = 'MPcover';
	divMPcover.id = 'MPcover';
	var w = my_getWidth(document.body, true);
	var h = my_getHeight(document.body, true);
	divMPcover.style.width = w+'px';
	divMPcover.style.height = h+'px';
	document.body.appendChild(divMPcover);
}