Question : Google maps map not centered

I have a website in which i have to dynamically show the map of a certain address. I currently use the enclosed html-code:
The problem is that the marker is always outside the window. I need to have just a marker (without the actual address etc) of the address, and this addres must be centered on the map. The address is dynamically, so i can't use lat/lang coordinates.
Code Snippet:
         
           
           
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<span id="ContentPlaceHolder1_tieude_as">Answer : Google maps map not centered</span>
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removed A from url... here it is...</div> <!-- richText -->
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1:
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             <pre id="codeSnippet450830" class="prettyprint"><iframe width="500" height="400" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="http://maps.google.nl/maps?f=q&amp;source=s_q&amp;hl=nl&amp;geocode=&amp;q=tramsingel 1 ,+breda,+nederland&amp;center=tramsingel 1 ,+breda,+nederland&amp;&amp;&amp;ie=UTF8&amp;z=14&amp;iwloc=&amp;output=embed&amp;size=500x400">
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