contenuto che si sovrappone

[rocco.mod]

salve ragazzi ho un problema dentro i tag div carico due tabelle ,solo che succede che se dentro la tabella superiore inserisco un dato in piu mi scende sotto la seconda tabella , stringendola e devormando il tutto

<{include file="header.tpl"}>
<div id="container">
<table width="100%"  border="0" cellspacing="0" cellpadding="0" ><tr><td>
<div id="header">
<!--  <<<<<<<CONTENUTO HEADER>>>>>>>>>> -->
<div id="header">
    <div class="logoheader">
          <h1 id="logo"><{$titlecms}></h1> 
        <span class="header1" ><{$companyslogan}> </span>
   </div>
</div>
<!--  <<<<<<< FINE CONTENUTO HEADER>>>>>>>>>> -->
</div>
<{if $modules_left  == 1 or $modules_duble == 1 }> 
<div id="navigation" class="rounded">
<!--  <<<<<<<CONTENUTO SINISTRO>>>>>>>>>> -->  
<{include file="modulesleft.tpl"}>
            <!--<<<<<<<CONTENUTO SINISTRO>>>>>>>>>>-->
           </div>
          <{/if}>
             <{if $modules_right  == 1 or $modules_duble == 1 }> 
           <div id="extra" class="rounded">
            <!--  <<<<<<<CONTENUTO DESTRO>>>>>>>>>>-->
           <{include file="modulesright.tpl"}>
            <!--<<<<<<<CONTENUTO DESTRO>>>>>>>>>> -->
           </div>
              <{/if}> 
           <div id="content" class="rounded" >
            <!--<<<<<<<CONTENUTO CENTRALE>>>>>>>>>>      -->
<{if $error_login }>
<div style="text-align:center; background-color:#FFEAEA; width:100%; padding-top:5px; padding-bottom:5px; border: 1px solid #E82A2A; " > Username O Password Unknown
<!--<{$pass}>-->
</div>
<{/if}>        
<{$pag_cms.contents}>
<!--<<<<<<< FINE CONTENUTO CENTRALE>>>>>>>>>> -->
<div>
<{if $backurl !=''}>
<table width="100%"  border="0" cellspacing="0" cellpadding="0"><tr>
<td width="16"><a href="<{$backurl[0]}>" title="<{$backurl[1]}>">
<img src="<{$pathcms}>templates/admin_default/images/icone_mini/icon_back.gif" border="0">
</a></td>
<td align="left"><span class="smalltext"><a href="<{$backurl[0]}>" title="<{$backurl[1]}>">&nbsp;<{$backurl[1]}></a></span></td>
</tr></table> 
<{/if}>
</div>
           </div>
         
           <div id="footer" > 
            <!--  <<<<<<<CONTENUTO FOOTTER>>>>>>>>>> -->
           <p>MyHardware.org</p>
           </div>
           </td></tr></table>
       </div>
 <{include file ="footer.tpl"}>

[rocco.mod]

ragazzi aiuto percortesia