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Hi, try using my code in the footer of the datapage: <SCRIPT LANGUAGE="JavaScript"> function check() { var v_cost = parseFloat(document.getElementById("InsertRecordFirst_field").value); var v_retail = parseFloat(document.getElementById("InsertRecordSecond_field").value); if(v_cost>v_retail) { window.alert("Cost must be less"); return false; } } document.getElementById("caspioform").onsubmit=check; </SCRIPT> Replace First_field with field name where you store cost, and Second_field with field name where you store retail amount. Hope it helps!