a couple of js errors reported by the browser when configuring items :

1.
JavaScript - zabbix-1.7.1/popup.php?dstfrm=web.items.item.php&dstfld1=key&srctbl=help_items&srcfld1=key_&itemtype=0
Inline script compilation
Syntax error while loading: line 14 of inline script at zabbix-1.7.1/popup.php?dstfrm=web.items.item.php&dstfld1=key&srctbl=help_items&srcfld1=key_&itemtype=0 :
Expected statement
</script>
-^

2.
JavaScript - zabbix-1.7.1/popup.php?dstfrm=web.items.item.php&dstfld1=key&srctbl=help_items&srcfld1=key_&itemtype=0
Event thread: load
Error:
name: ReferenceError
message: Statement on line 1: Undefined variable: zbxCallPostScripts