Unsure if this is possible or just bad code.

void OffHold(int ID)

if (On_Hold_Date == "null");

{

    alert "Sorry, You can not take Off Hold that is not On Hold";

    cancel submit;

}

else

{

    rec  =  On_Hold_Test_App  [ID == input.ID];

    rec.Off_Hold_Date = zoho.currentdate;

    rec.Due_Date = zoho.currentdate.addBusinessday(2);

}

I'm receiving the following error message:

Error at line number : 2
Improper Statement
Error might be due to missing ';' at end of the line or incomplete expression

I'm just  trying  to build in some basic error handling.