function showSwitch(szDivID, iState) // 1 visible, 0 hidden
{
    if(document.layers)	   //NN4+
    {
       document.layers[szDivID].visibility = iState ? "show" : "hide";
    }
    else if(document.getElementById)	  //gecko(NN6) + IE 5+
    {
        var obj = document.getElementById(szDivID);
        obj.style.visibility = iState ? "visible" : "hidden";
		obj.style.display = iState ? "" : "none";
    }
    else if(document.all)	// IE 4
    {
		alert('IE4');
        document.all[szDivID].style.visibility = iState ? "visible" : "hidden";
    }
	iState = !iState;
}

function changeImgSrc(img_id,img_src) {
	document.getElementById(img_id).src=img_src;
}