//Coded by  Aboolfazl Ehsani mehriz.net
var goto_top_type = -1;
var goto_top_itv = 0;

// Goto Top
function goto_top_timer()
{
	var y = goto_top_type == 1 ? document.documentElement.scrollTop : document.body.scrollTop;
	var moveby = 15;
	y -= Math.ceil(y * moveby / 100);
	if (y < 0){y = 0;}
	if (goto_top_type == 1) {document.documentElement.scrollTop = y;}else{document.body.scrollTop = y;}
	if (y == 0) {
		clearInterval(goto_top_itv);
		goto_top_itv = 0;
	}
}



function goto_top()
{
	if (goto_top_itv == 0) {
		if (document.documentElement && document.documentElement.scrollTop) {
			goto_top_type = 1;
		}else if (document.body && document.body.scrollTop) {
			goto_top_type = 2;
		}else{
			goto_top_type = 0;
		}
		if (goto_top_type > 0) {goto_top_itv = setInterval('goto_top_timer()', 50);}
	}
}

var goto_bottom_type = -1;
var goto_bottom_itv = 0;

// Goto Bottom
function goto_bottom_timer()
{
	var y = goto_bottom_type == 1 ? document.documentElement.scrollBottom : document.body.scrollBottom;
	var moveby = 15;
	y -= Math.ceil(y * moveby / 100);
	if (y < 0){y = 0;}
	if (goto_bottom_type == 1) {document.documentElement.scrollBottom = y;}else{document.body.scrollBottom = y;}
	if (y == 0) {
		clearInterval(goto_bottom_itv);
		goto_bottom_itv = 0;
	}
}



function goto_bottom()
{
	if (goto_bottom_itv == 0) {
		if (document.documentElement && document.documentElement.scrollBottom) {
			goto_bottom_type = 1;
		}else if (document.body && document.body.scrollBottom) {
			goto_bottom_type = 2;
		}else{
			goto_bottom_type = 0;
		}
		if (goto_bottom_type > 0) {goto_bottom_itv = setInterval('goto_bottom_timer()', 50);}
	}
}