OOP Javascript Question

[nullpointer]

I think this is a pretty easy to fix error made by a newb ( me. Can anyone tell me why the call to "this.slideNext() " in the code below does not work. Apparently "this.slideNext() " is not a function?

function ScoopAnimation(_path, _start, _end, _delay){
	this.start = _start
	this.end = _end;
	this.delay = _delay;
	this.path = _path
	this.currentFrame = _start;
		
		
		
	this.slideNext() = function (){
		this.currentFrame ++;
		console.log('  next this.currentFrame  : ' +this.currentFrame );
		}	
		
		
	
	this.start= function ()	
	{
		console.log('next this.start()   : ' +this.currentFrame );
//THE NEXT LINE CAUSES THE ERROR!
		this.slideNext() 
		 
		
		
		}
	
		this.start();
		
}

[DaveyErwin]

this.slideNext() = function (){
should be
this.slideNext = function (){

[nullpointer]

arrr. Thanks so much!