I want to check the excution of function is completed then next line will execute

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Javascript

Java

struts

here is the logic code
i want to check the execution of function b , if it is completed then next will line execute. how can i do this

function a()
{
   b();
   document.forms[0].action=another action + function=search + parmater=pagerefresh;
   document.forms[0].submit();
}

function b()
{
   document.forms[0].action=action+function=rejectall;
   document.forms[0].submit();
}