if(show_back==true){        
    	document.write('<table width="100%" border="0" cellspacing="0" cellpadding="0">');
    	document.write('<tr> ');
    	document.write('<td align="right"> ');
    	document.write('<table width="70" border="0" cellspacing="0" cellpadding="0">');
    	document.write('<tr>');
    	document.write('<td align="right">');
    	document.write('<p span class="backbuttone"><a href="javascript:history.back(-1)">back</a></p>');
    	document.write('</td>');
    	document.write('</tr>');
    	document.write('</table>  ');
    	document.write('</td>');
    	document.write('</tr>');
    	document.write('</table>');
	}