change:
onChange=""document.domains_1_ATC_<?php echo $row_Recordset1["URLID"]; ?>.domains_1_Description_Add.value = document.domains_1_ATC_<?php echo $row_Recordset1["URLID"]; ?>.domains_1_Price_Add[document.domains_1_ATC_<?php echo $row_Recordset1["URLID"]; ?>domains_1_Price_Add.selectedIndex].text""
to:
onChange="document.domains_1_ATC_<?php echo $row_Recordset1["URLID"]; ?>.domains_1_Description_Add.value = document.domains_1_ATC_<?php echo $row_Recordset1["URLID"]; ?>.domains_1_Price_Add[document.domains_1_ATC_<?php echo $row_Recordset1["URLID"]; ?>domains_1_Price_Add.selectedIndex].text"