JS.Prototype.Cannot read property 'apply' of undefined

Trying to make little module for searching some stuff.

function SearchModule() {
    this.softName = "",
    this.userLogin = undefined,
    this.init.apply(this, arguments);
}

SearchModule.prototype = {
    init: function (softname, userlogin) {
        this.softName = softname;
        this.userLogin = userlogin;
    },
    clearField: function () {
     //whatever
    },
    searchData:function(args){
     //whatever
    }

}

When I try to call it I get an error

Uncaught TypeError: Cannot read property 'apply' of undefined

I use it like this

var searchObject;
function searchTestPart1() {
    searchObject = SearchModule("PPC", usermail);
    searchObject.getSearchData("Test");

}

Whats wrong? P.S. Maybe I making some silly mistake, sorry. But for some reason I don't understand what's wrong here