This excerpt taken from the MOLX DEF 14A filed Sep 23, 2005.
Determination of a Quorum
The presence at the meeting, in person or by proxy, of a majority of the outstanding shares of each of the Common Stock and Class B Common Stock classes entitled to vote will constitute a quorum at the meeting. Abstentions, broker “non-votes” and withheld votes are counted as present for purposes of determining the presence or absence of a quorum for the transaction of business. A broker “non-vote” occurs when a nominee holding shares for a beneficial owner does not vote on a proposal because the nominee does not have discretionary voting power and has not received instructions from the beneficial owner.