$(function(){
	if(window.screenTop == undefined){ // firefox
			init_x = window.screenX;
			init_y = window.screenY;
			init_w = window.innerWidth;
			init_h = window.innerHeight;
	} else { // ie
			init_x = window.screenLeft;
			init_y = window.screenTop;
			init_w = window.document.body.clientWidth;
			init_h = window.document.body.clientHeight;
	}
});