img1=new Image()
img1.src="images/home_btn.jpg" 
img2=new Image()
img2.src="images/jobs_btn.jpg" 
img3=new Image()
img3.src="images/city_btn.jpg" 
img4=new Image()
img4.src="images/appertments_btn.jpg" 
img5=new Image()
img5.src="images/class_btn.jpg" 
img6=new Image()
img6.src="images/forums_btn.jpg"
img7=new Image()
img7.src="images/employers_btn.jpg"