theTexts = new Array()
theTexts[0] = "<a HREF=http://www.rt98.com/google.htm target=_blank><img src=http://www.rt98.com/images/google-ad1.gif height=60 width=468 border=0 alt='瑞特数码　广告1'>";
theTexts[1] = "<a HREF=http://www.rt98.com/google.htm target=_blank><img src=http://www.rt98.com/images/google-ad1.gif height=60 width=468 border=0 alt='瑞特数码　广告2'>";
theTexts[2] = "<a HREF=http://www.rt98.com/host.htm target=_blank><img src=http://www.rt98.com/images/westads5.gif height=60 width=468 border=0 alt='瑞特数码　广告3'>";
theTexts[3] = "<a HREF=http://www.rt98.com/chuangye.htm target=_blank><img src=http://www.rt98.com/images/westads10.gif height=60 width=468 border=0 alt='瑞特数码　广告4'>";
theTexts[4] = "<a HREF=http://www.rt98.com/google.htm target=_blank><img src=http://www.rt98.com/images/google-ad1.gif height=60 width=468 border=0 alt='瑞特数码　广告5'>";
theTexts[5] = "<a HREF=http://www.rt98.com/chuangye.htm target=_blank><img src=http://www.rt98.com/images/westads10.gif height=60 width=468 border=0 alt='瑞特数码　广告6'>";

var rand = Math.round(Math.random()*5);
while (rand >5) {
   rand = Math.round(Math.random()*5);
}
document.write(theTexts[rand]);