function swtch(num, imgname) {
document[imgname].src = img[num].src;
}
img = new Array();
img[1]  = new Image();
img[1].src = "images/ctverec-blue.gif";
img[2]  = new Image();
img[2].src = "images/ctverec-yelow.gif";

img[3]  = new Image();
img[3].src = "images/ctverec-green.gif";
img[4]  = new Image();
img[4].src = "images/ctverec-orange.gif";

img[5]  = new Image();
img[5].src = "images/ctverec-red.gif";
img[6]  = new Image();
img[6].src = "images/ctverec-orange.gif";

img[7]  = new Image();
img[7].src = "images/ctverec-yelow.gif";
img[8]  = new Image();
img[8].src = "images/ctverec-orange.gif";

img[9]  = new Image();
img[9].src = "images/pole_grafika2.gif";
img[10]  = new Image();
img[10].src = "images/pole_grafika2b.gif";

img[11]  = new Image();
img[11].src = "images/pole_tisk2.gif";
img[12]  = new Image();
img[12].src = "images/pole_tisk2b.gif";

img[13]  = new Image();
img[13].src = "images/pole_web2.gif";
img[14]  = new Image();
img[14].src = "images/pole_web2b.gif";

img[15]  = new Image();
img[15].src = "images/pole_akce2.gif";
img[16]  = new Image();
img[16].src = "images/pole_akce2b.gif";