function reservas() {
LeftPosition = (screen.width) ? (screen.width-1000)/2 : 0;
TopPosition = (screen.height) ? (screen.height-400)/2 : 0;
settings ='height=400,width=1000,top='+TopPosition+',left='+LeftPosition+',scrollbars=yes'
win = window.open("http://www.opentable.com/single.aspx?rid=76765&restref=76765","Reserva",settings)
}