function reachBottom(){
    var scrollTop = 0;
    var clientHeight = 0; 
    var scrollHeight = 0;
 
    if(document.documentElement && document.documentElement.scrollTop) {  
        scrollTop = document.documentElement.scrollTop;  
    } else if (document.body) {  
	scrollTop = document.body.scrollTop;  
    }  
 
    if(document.body.clientHeight && document.documentElement.clientHeight) {  
        clientHeight = (document.body.clientHeight < document.documentElement.clientHeight) ? document.body.clientHeight : document.documentElement.clientHeight;          
    } else {  
        clientHeight = (document.body.clientHeight > document.documentElement.clientHeight) ? document.body.clientHeight : document.documentElement.clientHeight;      
    }
 
    scrollHeight = Math.max(document.body.scrollHeight,document.documentElement.scrollHeight);
 
    if(scrollTop + clientHeight == scrollHeight) {  
        return true;  
    } else {  
        return false; 
    }
}