How do you know the scroll bar has reached bottom of a page

Question

I have a HTML page, when the scroll bar reaches bottom of the page I need to slide in a div from bottom-right containing an iframe.

Using JQuery I have implemented

Answer 1

 
 
 
     
 
 

 
    
  
            Data Center  
        
 
    
 
     
        
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
            
Hello Friends
 
        
 
     
     
 

 

This worked for me. Enjoy the code :)