function ventanaSecundaria (URL){ 
window.open(URL,"ventana1","width=750,height=450,Titlebar=NO,scrollbars=YES,resizable=1") 
} 
function ventanaImagen (URL){ 
window.open(URL,"ventana2","left=100,top=100,Titlebar=NO,scrollbars=YES,resizable=1") 
}