function searchV(field,text) {
    if (field.value == text) {
        field.value = '';
    }
}
function searchN(field,text) {
    if (field.value == '') {
        field.value = text;
    }
}

function changeClassO(style){
    style.className=style.className+'O';
}
function changeClass(style){
    style.className=style.className.substring(0,style.className.length-1);
}

function changeImageOver(image,over){
    var ext=image.src.substring(image.src.length-4,image.src.length);
    var file=image.src.substring(0,image.src.length-4);
    image.src=file+over+ext;	        
}

function changeImage(image,over){
    var over_size=over.length;
	var ext=image.src.substring(image.src.length-4,image.src.length);
	var file=image.src.substring(0,image.src.length-(over_size+4));
	image.src=file+ext;
}

var prev_ul_id;
function doSubmenu(ul_id){
    try {
	    if(prev_ul_id){
		    document.getElementById(prev_ul_id).style.display='none';
		    document.getElementById(prev_ul_id).parentNode.className='mainlevel';
	    }
	    document.getElementById(ul_id).getElementsByTagName("li")[0].style.background='none';// remove dotted line from first submenu item
	    document.getElementById(ul_id).style.display='block';
	    document.getElementById(ul_id).parentNode.className='sublevel';
	    prev_ul_id=ul_id;
    }
    catch (err) {
    }
}