急救！表格于表格之间有缝隙，请问如何解决

这是有问题的代码：

google_ad_width = 250; google_ad_height = 250; google_ad_format = "250x250_as"; google_color_url = "000000";

<table width="1023" border="0" cellpadding="0" cellspacing="0">

<tr>

<td height="75" colspan="4"><img src="images/bbmzl_1.jpg" width="1023" height="75" border="0" usemap="#Map" />

<map name="Map" id="Map">

<area shape="rect" coords="321,37,371,64" href="http://www.bluespace.cn/CF/bbzt.html" />

<area shape="rect" coords="259,34,311,60" href="bbdd.html" />

<area shape="rect" coords="384,37,431,64" href="http://www.bluespace.cn/CF/bbzl.html" />

<area shape="rect" coords="606,38,655,63" href="bbbz1.html" />

<area shape="rect" coords="664,38,716,65" href="bbbz2.html" /><area shape="rect" coords="724,39,775,62" href="http://www.bluespace.cn/CF/bbbz3.html" />