function pop_pic_viewer(id, cat, obj_id){
 var url = "pic_viewer.php?obj_id="+obj_id+"&pic_id="+id+"&img_cat="+cat;
 win=window.open( url,"pic_viewer","resizable=yes, width=690, height=470, scrollbars");
 win.focus();
}

function pop_skipper_info(id){
 var url = "skipper.php?id="+id;
 win=window.open( url,"skipper","resizable=yes, width=690, height=470, scrollbars");
 win.focus();
}


function pop_invitation_form(){
 win=window.open("invitation_form.php", "invitation", "resizable=yes, width=565, height=470, scrollbars");
 win.focus();
}