function zoom(href){
	var left,top,width,height,target,params;
	if(screen.availWidth<1024){
		left=0;
		width=screen.availWidth;
	}else{
		left=(screen.availWidth-1024)/2;
		width=1024;
	}
	top=0;
	height=screen.availHeight;
	target='zoom';
	params='left='+left+',top='+top+',width='+width+',height='+height+',menubar=no,directories=no,status=no,scrollbars=yes,resizable=no';
	window.open(href,target,params);
	return false;
}