var totalImages = 18; 

if(document.images){
     mFX = new Array(totalImages);
     for(i = 0; i < mFX.length; i++){
          mFX[i] = new Image();
          }
     mFX[0].src = "images/gallery1.jpg";
     mFX[1].src = "images/gallery2.jpg";
     mFX[2].src = "images/gallery3.jpg";
     mFX[3].src = "images/gallery4.jpg";
     mFX[4].src = "images/gallery5.jpg";
     mFX[5].src = "images/gallery6.jpg";
     mFX[6].src = "images/gallery7.jpg";
     mFX[7].src = "images/gallery8.jpg";
     mFX[8].src = "images/gallery9.jpg";
     mFX[9].src = "images/gallery10.jpg";
     mFX[10].src = "images/gallery11.jpg";
     mFX[11].src = "images/gallery12.jpg";
     mFX[12].src = "images/gallery13.jpg";
     mFX[13].src = "images/gallery14.jpg";
     mFX[14].src = "images/gallery15.jpg";
     mFX[15].src = "images/gallery16.jpg";
     mFX[16].src = "images/gallery17.jpg";
     mFX[17].src = "images/gallery18.jpg";
     }

function imgFX(img, num){
     if(document.images){
          document.images[img].src = mFX[num].src;
          }
     }