MPG's/code question

[jgcalifornia]

The site Im working on has several of MPG's. They are meant to open in a new window and play. Firefox sometimes plays them, safari just shows the quicktime logo, and I dont know why.
any help is greatly appreciated. Current code-

<table width="98%" border="0" cellspacing="5" cellpadding="5" align="center">
<tr>
<td width="23%">
<div class="c1"><a href="movies/adventure1918.mpg" target="_blank"><img src="adventure1918.jpg" alt="" width="120" height="88" border="0"></a></div></td>
<td>
<div class="c1"><a href="movies/1917.mpg" target="_blank"><img src="1917.jpg" alt="" width="120" height="88" border="0"></a></div></td>
<td>
<div class="c1"><a href="movies/ancient1919.mpg" target="_blank"><img src="ancient1919.jpg" alt="" width="120" height="88" border="0"></a></div></td>
<td>
<div class="c1"><a href="movies/1910.mpg" target="_blank"><img src="1910.jpg" alt="" width="120" height="88" border="0"></a></div></td>
</tr>