if(document.images)
   {
	home_o = new Image(123,35);
	home_o.src = 'images/home_o.jpg';
	journal_o = new Image(123,35);
	journal_o.src = 'images/journal_o.jpg';
	mtclib_o = new Image(123,35);
	mtclib_o.src = 'images/mtclib_o.jpg';
	orientation_o = new Image(123,35);
	orientation_o.src = 'images/orientation_o.jpg';
	selftests_o = new Image(123,35);
	selftests_o.src = 'images/selftests_o.jpg';
	reviews_o = new Image(123,35);
	reviews_o.src = 'images/reviews_o.jpg';
	discussion_o = new Image(123,35);
	discussion_o.src = 'images/discussion_o.jpg';
	examples_o = new Image(123,35);
	examples_o.src = 'images/examples_o.jpg';
	links_o = new Image(123,35);
	links_o.src = 'images/links_o.jpg';
	sylllogo_o = new Image(123,35);
	sylllogo_o.src = 'images/sylllogo_o.jpg';
	callogo_o = new Image(123,35);
	callogo_o.src = 'images/callogo_o.jpg';

    }

    function picSwap(i1,i2)
    {      
	var temp = i1.src
	i1.src=i2.src
	i2.src = temp    
    }