layout skewed in IE

The header of my page is skewed in IE but displays correctly in Firefox. What do I need to adjust? I've attached the code in the file, as well as the associated stylesheet.

<div class="main">
<!--==========header=========== -->
<div id="header">
	<div class="logo"> 
	
	
	</div>
    <div class="hd_right">
   	  <div class="nv">
       	<div class="indent">
                <div class="column"><a href="index2.php"><img src="images_html/nv_1_pic.jpg" alt="" /></a></div>
          <div class="box_1"><a href="index2.php">Home</a></div>
          <div class="column"><img src="images_html/nv_2_pic.jpg" alt="" /></div>
                <div class="box_2"><a href="logout.php">Logout</a></div>                
                <div class="clear"></div>
        </div>
      </div>        
        <div class="menu">       	  <img src="images_html/bt_1_sel.jpg" alt="" width="120" height="39" id="Image3" /><a href="services.html" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image4','','images_html/bt_2_sel.jpg',1)"><img src="images_html/bt_2.jpg" alt="" width="112" height="39" id="Image4" /></a><a href="portfolio.php" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image5','','images_html/bt_3_sel.jpg',1)"><img src="images_html/bt_3.jpg" alt="" width="112" height="39" id="Image5" /></a><a href="contact.html" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image6','','images_html/bt_4_sel.jpg',1)"><img src="images_html/bt_4.jpg" alt="" width="115" height="39" id="Image6" /></a> </div>
        <div class="clear"></div>
    </div>
    <div class="clear"></div>
    <div class="mp">
    	<div class="box_1">
        	<div class="indent"><img src="images_html/mp_h_1.gif" alt="" /><br />
                	<div class="indent">
                    	All it takes is three simpe steps to find your dream property. We specialize in ensuring that the process is hassle-free for you.
                          <span class="tar in10"><a href="portfolio.php"><img src="images_html/mp_sp.jpg" alt="" /></a></span>
                          <div class="tar in10"></div>
              </div>
          </div>
      </div>
        <div class="box_2">
        	<div class="indent">
            	<img src="images_html/mp_h_2.gif" alt="" /><br />
                <div class="indent">
                	Search for properties and save results in a portfolio for continuous access. Your portfolio will be available every time you log in.
                      <span class="tar in10"><a href="portfolio.php"><img src="images_html/mp_sp.jpg" alt="" /></a></span>
                      <div class="tar in10"></div>
              </div>	
          </div>
        </div>
        <div class="box_3">&nbsp;</div>
        <div class="clear"></div>
    </div>
</div>
</div>

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styles.txt
Q1.jpg