function Invoke-JSAdd ($a, $b) {             
    Add-Type –Path  "C:\jint\Jint.dll"            
              
    $JavaScript = " 
        function add(a, b) {  
            return a + b;  
        } 
    "            
    $add = (New-Object Jint.Engine).             
            Execute($JavaScript).             
            GetValue("add")             
              
    $add.Invoke($a, $b).ToString()             
}