Getting window size and scroll bars position in JavaScript/DHTML

window_size_and_scroll_bars_position.js

/**
 *    Getting window size and scroll bars position in JavaScript/DHTML
 *    http://www.softcomplex.com/docs/get_window_size_and_scrollbar_position.html  
 */

function f_clientWidth() {
	return f_filterResults (
		window.innerWidth ? window.innerWidth : 0,
		document.documentElement ? document.documentElement.clientWidth : 0,
		document.body ? document.body.clientWidth : 0
	);
}
function f_clientHeight() {
	return f_filterResults (
		window.innerHeight ? window.innerHeight : 0,
		document.documentElement ? document.documentElement.clientHeight : 0,
		document.body ? document.body.clientHeight : 0
	);
}
function f_scrollLeft() {
	return f_filterResults (
		window.pageXOffset ? window.pageXOffset : 0,
		document.documentElement ? document.documentElement.scrollLeft : 0,
		document.body ? document.body.scrollLeft : 0
	);
}
function f_scrollTop() {
	return f_filterResults (
		window.pageYOffset ? window.pageYOffset : 0,
		document.documentElement ? document.documentElement.scrollTop : 0,
		document.body ? document.body.scrollTop : 0
	);
}
function f_filterResults(n_win, n_docel, n_body) {
	var n_result = n_win ? n_win : 0;
	if (n_docel && (!n_result || (n_result > n_docel)))
		n_result = n_docel;
	return n_body && (!n_result || (n_result > n_body)) ? n_body : n_result;
}


/**
 *  
 */ 
function scrollTR()
{ 
    var pos = 0 ;
    var _TRoll  = function() 
        { 
             if(window.pageYOffset &&  window.pageYOffset == 200 ) return ;
             if(window.document.documentElement && document.documentElement.scrollTop == 200 ) return ;
             if( window.document.body && window.document.body.scrollTop == 200 ) return ;
             pos  += 10;
             window.scrollTo(0,pos);
             if(pos == 200 ) 
                {
                    return ;
                } else 
                {
                    setTimeout(_TRoll,200);
                }
        } 
   return _TRoll; 
}