Creating and storing a variable value

Hi,

Can anyone tell me how do i create and store a value in a variable?

Basically, i have a HTML  a table and i want to compare a table cell value with another table cell value generated later.

First Generated Table(a.html)
<table border="1">            
<tr>
<td>teste
<td>erick</td>
</tr>
<tr>
<td>akamine</td>
<td>hirata</td>
</tr>
</table>

Second Generated table(b.html)
<table border="1">
<tr>
<td>teste2
<td>erick2</td>
</tr>
<tr>
<td>akamine2</td>
<td>hirata2</td>
</tr>
</table>

I want to store the value erick in the 1st table and later compare it with the value hirata2 in the 2nd table.

Thanks in advance.