// Select dandom 4 difit code.

numPix = new Array ('cd0.gif', 'cd1.gif', 'cd2.gif', 'cd3.gif', 'cd4.gif', 'cd5.gif', 'cd6.gif', 'cd7.gif', 'cd8.gif', 'cd9.gif');
imgCt = numPix.length;
code1 = Math.floor (Math.random() * imgCt);
code2 = Math.floor (Math.random() * imgCt);
code3 = Math.floor (Math.random() * imgCt);
code4 = Math.floor (Math.random() * imgCt);
codeNum = (code1 * 1000) + (code2 * 100) + (code3 * 10) + code4;
codeImg1 = '<img src="images/' + numPix[code1] + '" height="22" width="22" border="0">';
codeImg2 = '<img src="images/' + numPix[code2] + '" height="22" width="22" border="0">';
codeImg3 = '<img src="images/' + numPix[code3] + '" height="22" width="22" border="0">';
codeImg4 = '<img src="images/' + numPix[code4] + '" height="22" width="22" border="0">';
codeImg = codeImg1 + codeImg2 + codeImg3 + codeImg4;