function writeMastHead(which)
{
    var html_str = '<table cellspacing="0" cellpadding="0" border="0" class="mainWidth" align="center">';

    if (which=='home')
        html_str+= '<tr>'	
                 + '<td valign="middle" class="mastbkg1"><img src="images/mast/masthead_logo.gif" width="300" height="100" alt="" border="0" hspace="10"></td>'
				 + '</td>';

    if (which=='about')
        html_str+= '<tr>'	
                 + '<td valign="middle" class="mastbkg2"><img src="images/mast/masthead_logo.gif" width="300" height="100" alt="" border="0" hspace="10"></td>'
				 + '</td>';

    if (which=='products')
        html_str+= '<tr>'	
                 + '<td valign="middle" class="mastbkg3"><img src="images/mast/masthead_logo.gif" width="300" height="100" alt="" border="0" hspace="10"></td>'
				 + '</td>';

    if (which=='sales')
        html_str+= '<tr>'	
                 + '<td valign="middle" class="mastbkg4"><img src="images/mast/masthead_logo.gif" width="300" height="100" alt="" border="0" hspace="10"></td>'
				 + '</td>';
    
    if (which=='contact')
        html_str+= '<tr>'	
                 + '<td valign="middle" class="mastbkg6"><img src="images/mast/masthead_logo.gif" width="300" height="100" alt="" border="0" hspace="10"></td>'
				 + '</td>';


   else if (which=='')
        html_str+= '<tr><td></td></tr>';
				 
	html_str+= '</tr></table>';


    document.write(html_str);
}