function open_joinus(url) {
mywin = window.open(url,"win",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width=620,height=660');
}
function open_sidebar(url) {
mywin = window.open(url,"win",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width=620,height=600');
}