function show(tab)
{ 
 i=1;
    while (document.getElementById("m_"+i))
 {
 document.getElementById("m_"+i).style.display='none'; 
 i++;
 }
 document.getElementById(tab).style.display='block';
}
function subshow(st)
{ 
 i=1;
    while (document.getElementById("s_"+i))
 {
 document.getElementById("s_"+i).style.display='none'; 
 i++;
 }
 document.getElementById(st).style.display='block';
}


function hide(tab)
{  
 document.getElementById(tab).style.display='none'; 
 }
 
 function onmuschng(imgNm, imgSrc)
	{
		document[imgNm].src='../images/'+imgSrc;
	}