var getNextTag = function(element,tag)
{   
    var elem = element.nextSibling;
    while(elem!=null&&(elem.tagName==undefined||elem.tagName.toUpperCase()!=tag))
    {
        elem = elem.nextSibling;
    }
    return elem;
}

var getFirstChildTag = function(element,tag)
{   
    var elem = element.firstChild;
    if(elem.tagName==undefined||elem.tagName.toUpperCase()!=tag)
    {
        elem = getNextTag(elem,tag);
    }

    return elem;
}

var changeChildImage = function(element,path)
{   
    var elem = getFirstChildTag(element,'IMG');
    if(elem)
    {
        elem.src = path;
    }
}
var exchangeElementDisplay = function(elemId)
{
    var element = document.getElementById(elemId);
    var ind = element.className.indexOf('hided');
    if(ind==-1)
    {
        element.className = element.className + ' hided';
    }
    else
    {
        element.className = element.className.replace(/hided/,'');
    }
    return false;
}