function MCS(obj) //MoveCenterScreen
{
var innerHeight_ = window.innerHeight ? window.innerHeight : document.documentElement.offsetHeight;
obj.style.left = ( document.body.clientWidth / 2 - obj.clientWidth / 2  + document.body.scrollLeft) + 'px';
obj.style.top = ( document.documentElement.scrollTop + innerHeight_ / 2 - obj.clientHeight / 2 + document.body.scrollTop) + 'px';
}

function only_num(e)
	{
		var key = e.which || window.event.keyCode; 
		var evt= e || window.event;
    if(key==13){
     if($('#amount').val()>0) document.TabController.SetItem(1);
    }
    if ((key <48 || key >57) && key!=46 && key!=8 && key!=37 && key!=39){
     if(window.event) e.returnValue = false;
     else e.preventDefault();
    } 
	}