Iframe web resource inside account form to set SIC attribute

Hi, I have a webresource inside my account form. I want it to set the SIC field to a certain value when clicked.

function superUpdate()
{
 Xrm.Page.getAttribute(“SIC“).setValue(“test”);
}

This function doesnt seem to work for some reason.

I have declared this as well
<script src="../ClientGlobalContext.js.aspx" type="text/javascript"></script>

if anyone knows why the Xrm.Page doesnt seem to work please let me know.

Thanks in advance,

Jon