how to create .js file

hi, can u pls tell me how can convert bellow code ".js" file. after install file, should visible under "add-ons tools" & can run. thanks..

bellow code using delete available radio buttons.

	for (var i=(this.numfields-1); i>=0; i--) {
	var f=this.getfield(this.getnthfieldname(i));
	if (f.type == "radiobutton") {
	this.removefield(this.getnthfieldname(i));
	}
	}

in action wizard can create action code.

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