Fotiman - 9:54 pm on Feb 1, 2013 (gmt 0)

</font>

You didn't escape that, so your HTML parser will see that and may close your <script> element. If you make the change I suggested above, that will probably fix it. Alternatively, you need to escape the / in that string as in:
'<font color="#FF0000">Email is not valid. Please delete spaces.<\/font>';