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How to change CSS class onMouseOver event handler:
Create two clases for normal button and for hover button.

One for normal button example:

.button{
  -moz-border-radius: 3px 3px 3px 3px;
  border: 3px double #a9a9a9;
  cursor: pointer;
}

One for hover button:

.button:hover{
  background: #f5f5dc;
}

Second class change background color on button.