var imagefirst = 1;
var imagenumber = 189 ;
var randomnumber = Math.random() ;
images = new Array;
for(var i=imagefirst;i<=imagenumber;i++) { images[i] = "/cimkep/cimkep" + i + ".jpg"; } 
var rand1 = Math.round( (imagenumber-imagefirst) * randomnumber) + imagefirst;
var image = images[rand1];
document.write('<img alt="" id="cimkep" width="330" height="76" src="' + image + '" />')