I figured it out. I had to replace the line:
"<a href="<%=replace(myrow("assetlink"),"{assettag}",dscomputers.FieldValue("TAG", nothing))%>" target="_blank"><%=myrow("vendor")%> : <%# dscomputers.FieldValue("TAG", Container) %></a>"
with:
<a href="<%=replace(myrow("assetlink"),"{assettag}",dscomputers.FieldValue("model", nothing))%>" target="_blank"><%=myrow("vendor")%> : <%# dscomputers.FieldValue("model", Container) %></a>
in the aspx file "it-compdetail.aspx" and all works well!!!