Webread function will not change inputs for html website?

I'm trying to do a search query on the NCBI website so I use the following URL:

http://www.ncbi.nlm.nih.gov/protein/?term=DCT%5BAll+Fields%5D+AND+%22Homo+sapiens%22%5Bporgn%5D

I then want to change the sorting input to sort by the date modified. According to the source code, I need to change the following input to 'MDAT'

EntrezSystem2.PEntrez.Protein.Sequence_ResultsPanel.Sequence_DisplayBar.Sort

However, when I attempt to do so with the following command, it will not change the input? I've been able to use the command to change other inputs that have numerical inputs but I can't seem to change an input with a string input?

>> str=webread(url,'EntrezSystem2.PEntrez.Protein.Sequence_ResultsPanel.Sequence_DisplayBar.PrevSort','MDAT','EntrezSystem2.PEntrez.Protein.Sequence_ResultsPanel.Sequence_DisplayBar.PageSize',100);

Also, this is how the webpage looks viewed through mozilla's developer tool (attached).

[Walter Roberson]

Nothing is attached?

[John-William Sidhom]

sorry here