Wrong number of arguments or invalid property assignment

<IMG id="imgClose" onmouseover="javascript:mouseOver(this,'28 outerClose_on.GIF')" title="Close (Esc)"
							style="CURSOR: hand" onclick="javascript:CloseWindow();" tabIndex="5"  önmouseout="javascript:mouseOut(this,'28 outerClose_off.GIF')"
							src="../AxCommon/Images/28 outerClose_off.GIF" tag="4">

function mouseOver(img,name)
        {
        //debugger
            img.src = '../AxCommon/Images/' + name;
            img.style.cursor = 'hand';
        }

        function mouseOut(img,name)
        {
        //debugger
            img.src = '../AxCommon/Images/' + name;
            img.style.cursor = 'default';
        }