Syntax error in if statement for checkbox check

[jessim52446772]

I am trying to create a field that is only enabled when the checkbox next to it is checked. I managed to write the value to a field so I know it is On vs Off. 

Error says: "SyntaxError: missing ; before statement

1: at line 2

Here is my code:

If (this.getField("Knowledge arcana").value == "On") {event.value = ( this.getField("INT Modifier").value + this.getField("Ranks16").value ) + this.getField("Misc Mod16").value} else {event.value = ""};

Any help is greatly appreciated. 

[Nesa Nurani · Accepted solution]

Use if not If. Javascript is case sensitive.

[jessim52446772]

Wow, I had no idea! That fixed my issue. Thank you so so much!

[Bernd Alheit · Accepted solution]

Use if, not If