I would use this CSS rule:
#HMP_options table tr:nth-child(-2n + 4) {
display: none;
}
http://jsfiddle.net/ZXjWV/
Since this is IE9 +, you might want to make jQuery to it.
In this example, I assumed that you only want to hide the 2nd and 4th rows. If you want to hide 6, 8, etc., you must use the rule :nth-child(2n).
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