if (document.images) 
{
   img1 = new Image();
   img2 = new Image();
   img3 = new Image();
   img4 = new Image();
   img5 = new Image();
   img6 = new Image();
   img7 = new Image();
   img8 = new Image();
   img9 = new Image();
   img10 = new Image();
   img11 = new Image();
   img12 = new Image();
   img13 = new Image();
   img14 = new Image();
   img15 = new Image();
   img16 = new Image();
   img1.src = "images/navIntro_r1_c1_f2.jpg";
   img2.src = "images/navIntro_r2_c1_f2.jpg";
   img3.src = "images/navIntro_r3_c1_f2.jpg";
   img4.src = "images/navIntro_r4_c1_f2.jpg";
   img5.src = "images/navIntro_r5_c1_f2.jpg";
   img6.src = "images/navIntro_r6_c1_f2.jpg";
   img7.src = "images/navIntro_r7_c1_f2.jpg";
   img8.src = "images/navIntro_r8_c1_f2.jpg";
   img9.src = "images/navIntro_r9_c1_f2.jpg";
   img10.src = "images/navIntro_r10_c1_f2.jpg";
   img11.src = "images/navIntro_r11_c1_f2.jpg";
   img12.src = "images/navIntro_r12_c1_f2.jpg";
   img13.src = "images/navIntro_r13_c1_f2.jpg";
   img14.src = "images/navIntro_r14_c1_f2.jpg";
   img15.src = "images/navIntro_r15_c1_f2.jpg";
   img16.src = "images/navIntro_r18_c1_f2.jpg";
}