function wb_onclick() {
    wb = window.open('http://www.windows.ucar.edu/php/journal/WBentry.php', 'workbook', 
    'scrollbars,toolbar,menubar,resizable,location,width=750,height=600,innerWidth=750,innerHeight=600,left=0,top=0'); 
    wb.focus();
    wb.opener = self;
}