function getPageSize(){
	var scnWid, scnHei;
	if (self.innerHeight) {
		scnWid = self.innerWidth;
		scnHei = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) {
		scnWid = document.documentElement.clientWidth;
		scnHei = document.documentElement.clientHeight;
	} else if (document.body) {
		scnWid = document.body.clientWidth;
		scnHei = document.body.clientHeight;
	}
	return {width:scnWid, height:scnHei};
}