//preload images

if (document.images) {
       tab_author1 = new Image(130,50);
       tab_author2 = new Image(130,50);

       tab_author1.src = 'images/tab_author1.gif'
       tab_author2.src = 'images/tab_author2.gif'
 	   }
	   
if (document.images) {
       tab_news1 = new Image(130,50);
       tab_news2 = new Image(130,50);

       tab_news1.src = 'images/tab_news1.gif'
       tab_news2.src = 'images/tab_news2.gif'
 	   }
	   
if (document.images) {
       tab_com1 = new Image(130,50);
       tab_com2 = new Image(130,50);

       tab_com1.src = 'images/tab_com1.gif'
       tab_com2.src = 'images/tab_com2.gif'
 	   }
	   
if (document.images) {
       tab_contact1 = new Image(130,50);
       tab_contact2 = new Image(130,50);

       tab_contact1.src = 'images/tab_contact1.gif'
       tab_contact2.src = 'images/tab_contact2.gif'
 	   }