groovy Scripting Library

I have the below class in soapui bin/scripts folder.

package soapui.demo
class Greet 
{
def name
def log

Greet(who, log) 
{ 
name = who;
this.log = log 
}

def salute() { log.info "Hello $name" }

def static salute( who, log ) { log.info "Hello again $who!" }
}

how do i invoke this library in my project ?

what i tried is...

c= new Greet()
b=c.Greet(mani,vg)
log.info b