how to check current login user is in assignment group for incident table

[subhashini6]

hi

i write the business rule for display like this

var grpname = current.assignment_group.getDisplayValue();
gs.addInfoMessage(grpname);
g_scratchpad.grp = gs.getUser().isMemberOf(grpname);

and write the client script onload 

function onLoad() {

alert(g_scratchpad.grp);

alert("Hello1");
if (g_scratchpad.grp == 'true'){

alert("if con");
g_form.removeOption('state', '6'); //closed incomplete

g_form.removeOption('state', '7'); //closed skipped

}
else
{
alert("else con");
}

}

but ever time it is going to else block only.

when i am giving the alert(g_scratchpad.grp); the value is displaying true only.

where was the wrong in my code can u tell me any body.

[subhashini6]

i am just practicing g_scratchpad