function CNG() {
	document.write('<div align="center"><center><table width="600" cellpadding="0" cellspacing="0" border="0">');
	document.write('<tr>');
	document.write('<td width="600" align="center" valign="top" bgcolor="#ffffff">');
	document.write('<font size="-1">');
	document.write('<a href="cng_e.htm">Introduction</a> -  ');
	document.write('<a href="ships_particulars_e.htm">Ships particulars</a> -  ');
	document.write('<a href="structure_of_tanks_e.htm">Structure of tanks</a><br>');
	document.write('<a href="equipment_for_cargo_operations_e.htm">Equipment for cargo operations</a> - ');
	document.write('<a href="propulsion_system_e.htm">Propulsion system</a> - ');
	document.write('<a href="safe_and_secure_gas_transport_e.htm">Safe and secure gas transport</a>'); 
	document.write('</font></td>');
	document.write('</tr>');
	document.write('</table></center></div>');
	document.close();
}
function ECNG() {
	document.write('<div align="center"><center><table width="600" cellpadding="0" cellspacing="0" border="0">');
	document.write('<tr>');
	document.write('<td width="600" align="center" valign="top" bgcolor="#ffffff">');
	document.write('<font size="-1">');
	document.write('<a href="cng_e.htm">Introduction</a> -  ');
	document.write('<a href="ships_particulars_e.htm">Ships particulars</a> -  ');
	document.write('<a href="structure_of_tanks_e.htm">Structure of tanks</a><br>');
	document.write('<a href="equipment_for_cargo_operations_e.htm">Equipment for cargo operations</a> - ');
	document.write('<a href="propulsion_system_e.htm">Propulsion system</a> - ');
	document.write('<a href="safe_and_secure_gas_transport_e.htm">Safe and secure gas transport</a>'); 
	document.write('</font></td>');
	document.write('</tr>');
	document.write('</table></center></div>');
	document.close();
}
function footerCNG() {
	document.write('<div align="center"><center><table width="600" cellpadding="0" cellspacing="0" border="0">');
	document.write('<tr>');
	document.write('<td>');
	document.write('<hr>');
	document.write('</td>');
	document.write('</tr>');
	document.write('<tr>');
	document.write('<td width="600" align="center" valign="top" bgcolor="#ffffff">');
	document.write('<font size="-1">');
	document.write('<a href="cng_e.htm">Introduction</a> |  ');
	document.write('<a href="ships_particulars_e.htm">Ships particulars</a> |  ');
	document.write('<a href="structure_of_tanks_e.htm">Structure of tanks</a><br>');
	document.write('<a href="equipment_for_cargo_operations_e.htm">Equipment for cargo operations</a> | ');
	document.write('<a href="propulsion_system_e.htm">Propulsion system</a> | ');
	document.write('<a href="safe_and_secure_gas_transport_e.htm">Safe and secure gas transport</a>'); 
	document.write('</font></td>');
	document.write('</tr>');
	document.write('<tr>');
	document.write('<td>');
	document.write('<hr>');
	document.write('</td>');
	document.write('</tr>');
	document.write('</table></center></div>');
	document.close();
}
function footerECNG() {
	document.write('<div align="center"><center><table width="600" cellpadding="0" cellspacing="0" border="0">');
	document.write('<tr>');
	document.write('<td>');
	document.write('<hr>');
	document.write('</td>');
	document.write('</tr>');
	document.write('<tr>');
	document.write('<td width="600" align="center" valign="top" bgcolor="#ffffff">');
	document.write('<font size="-1">');
	document.write('<a href="cng_e.htm">Introduction</a> | ');
	document.write('<a href="ships_particulars_e.htm">Ships particulars</a> | ');
	document.write('<a href="structure_of_tanks_e.htm">Structure of tanks</a><br>');
	document.write('<a href="equipment_for_cargo_operations_e.htm">Equipment for cargo operations</a> | ');
	document.write('<a href="propulsion_system_e.htm">Propulsion system</a> | ');
	document.write('<a href="safe_and_secure_gas_transport_e.htm">Safe and secure gas transport</a>'); 
	document.write('</font></td>');
	document.write('</tr>');
	document.write('<tr>');
	document.write('<td>');
	document.write('<hr>');
	document.write('</td>');
	document.write('</tr>');
	document.write('</table></center></div>');
	document.close();
}