Nasıl bu görüntü sekme sistemi kullanarak geçerli sayfayı vurgular bir PHP navigasyon menüsü inşa edebilirsiniz?

<a href="index.php" title="Home">
    <img src="images/menu/SR_MenuHome.gif" 
        alt="Home" 
        width="52" 
        height="31" 
        onmouseover="this.src='images/menu/SR_MenuHome-ov.gif';" 
        onmouseout="this.src='images/menu/SR_MenuHome.gif';"
        />
</a>
<a href="company.php" title="Company">
    <img src="images/menu/SR_MenuCompany.gif" 
        alt="Company" 
        width="76" 
        height="31" 
        onmouseover="this.src='images/menu/SR_MenuCompany-ov.gif';" 
        onmouseout="this.src='images/menu/SR_MenuCompany.gif';" 
        />
</a>
<a href="investors.php" title="Investor Relations">
    <img src="images/menu/SR_MenuIR.gif" 
        alt="Investor Relations" 
        width="157" 
        height="31" 
        onmouseover="this.src='images/menu/SR_MenuIR-ov.gif';" 
        onmouseout="this.src='images/menu/SR_MenuIR.gif';" 
        />
</a>