// JavaScript Document

//Variables
var RndNum;
var FileExt=".jpg";
var FileName=""+FileExt;
var Location="images/";
var FullNameandDirectory="";
var FileNumber;

//Get a random number between 1 and 20
RndNum = Math.floor(Math.random()*19) + 1;

//Rework the Filemane
FileName=RndNum + FileExt;
FullNameandDirectory=Location+FileName;

document.write('<img src="' + FullNameandDirectory + '" ' + 'alt="Random Picture"');