var n = Math.round(((img2.length)-1) * Math.random()); 
document.write("<div align=center><a href="+ url2[n] +" target=_Blank onMouseOver=\"window.status='"+ txt2[n].replace(/\'/, "\\\'") +"'; return true; \" onMouseOut=\"window.status=''; return true;\"><img src="+ img2[n] +" border=0 width=468 height=60></a></div>");