teşekkürler hocam, bu kez
Parse error: syntax error, unexpected T_ECHO in on line 1
hatası ile karşılaştım güncel kodlama şu şekilde

<?php echo ($_SERVER[REQUEST_URI] == 'aaa.php?id=173&katid='echo geti($_GET[katid]);'') ? 
'<a href="aaa.php?id=173&katid=' echo geti($_GET[katid]);'"><img src="images/sahibinden2.png"/></a>' :
'<a href="aaa.php?id=173&katid=' echo geti($_GET[katid]);'"><img src="images/sahibinden.png"/></a>';

echo ($_SERVER[REQUEST_URI] == 'aaa.php?id=174&katid=' echo geti($_GET[katid]); '') ? 
'<a href="aaa.php?id=174&katid=' echo geti($_GET[katid]);'"><img src="images/emlakofisinden2.png"/></a>' :
'<a href="aaa.php?id=174&katid=' echo geti($_GET[katid]);'"><img src="images/emlakofisinden.png"/></a>';

echo ($_SERVER[REQUEST_URI] == 'aaa.php?id=175&katid=' echo geti($_GET[katid]);'') ? 
'<a href="aaa.php?id=175&katid=' echo geti($_GET[katid]);'"><img src="images/mute.png2"/></a>' :
'<a href="aaa.php?id=175&katid=' echo geti($_GET[katid]);'"><img src="images/mute.png"/></a>';

?>