String.format = function()
{
    if( arguments.length == 0 )
    {
        return null;
    }
 
    var str = arguments[0];
 
    for(var i=1;i<arguments.length;i++)
    {
        var re = new RegExp('\\{' + (i-1) + '\\}','gm');
        str = str.replace(re, arguments[i]);
    }
 
    return str;
}

function mouseCoords(ev){
	if(ev.pageX || ev.pageY){
		return {x:ev.pageX, y:ev.pageY};
	}
	return {
		x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
		y:ev.clientY + document.body.scrollTop  - document.body.clientTop
	};
}

function getMouseOffset(target, ev){
	ev = ev || window.event;

	var docPos    = getPosition(target);
	var mousePos  = mouseCoords(ev);
	return {x:mousePos.x - docPos.x, y:mousePos.y - docPos.y};
}

function getPosition(e){
	var left = 0;
	var top  = 0;

	while (e.offsetParent){
		left += e.offsetLeft;
		top  += e.offsetTop;
		e     = e.offsetParent;
	}

	left += e.offsetLeft;
	top  += e.offsetTop;

	return {x:left, y:top};
}

function getElementsByCondition(condition,container){ 
    container = container||document;
    var all = container.all||container.getElementsByTagName('*');
    var arr = [];
    for(var k=0;k<all.length;k++) 
    { 
        var elm = all[k];
        if(condition(elm,k)) arr[arr.length] = elm;
    } 
    return arr;
}