resume_on = new Image; resume_on.src ='images/resume_btn_on.jpg';
resume_off = new Image; resume_off.src ='images/resume_btn.jpg';

about_on = new Image; about_on.src ='images/resume_btn_on.jpg';
about_off = new Image; about_off.src ='images/resume_btn.jpg';

contact_on = new Image; contact_on.src ='images/resume_btn_on.jpg';
contact_off = new Image; contact_off.src ='images/resume_btn.jpg';