var image1 = new Image();
image1.src = "../images/salesmap.gif";
var image2 = new Image();
image2.src = "../images/salesmap_NA.gif";
var image3 = new Image();
image3.src = "../images/salesmap_EUR.gif";
var image4 = new Image();
image4.src = "../images/salesmap_ASIA.gif";
var image5 = new Image();
image5.src = "../images/salesmap_ME.gif";
var image6 = new Image();
image6.src = "../images/salesmap_SA.gif";
var image7 = new Image();
image7.src = "../images/salesmap_AFR.gif";
var image8 = new Image();
image8.src = "../images/salesmap_AUS.gif";

function roll(img_name1, img_src1)
   {
   document[img_name1].src = img_src1;
   }