function open_win(link,_width,_height)
{
    y = (screen.availHeight - _height)/2;
    x = (screen.availWidth - _width)/2;

	var optiuni='width='+_width+',height='+_height+',screenX='+x+',screenY='+y+',top='+y+',left='+x+',scrollbars=yes,resizable=no,location=no,toolbar=no,status=no,menubar=no';
	window.open(link,'mywindow',optiuni);
}