function treeSelected(sel){
	
	var selID = sel.id;
	var selIDNum = parseInt(selID.replace(/selID_/g, ""));

	var curValue = sel.options[sel.selectedIndex].value;

	for(var i=selIDNum+1;i<=4;i++){

		if($('selID_'+i)){
			try{
				$('status').removeChild($('selWrap_'+i));
			}catch(err){
				alert('Error [remove wrap('+i+')]: descr: ' + err.description + '; name: '+err.name + '; message: '+ err.message);
			}
		}
	}

	if(curValue!=''){

	    var req = new JsHttpRequest();
	    req.onreadystatechange = function() {
	        if(req.readyState == 4){
				
				if(req.responseJS.select!=0){
					el = document.createElement('div');
					el.id = 'selWrap_'+(selIDNum+1);
					el.innerHTML = req.responseJS.select;
					$('status').appendChild(el);
				}else{
					$('podbor-submit').style.display = 'block';
				}
	        }
	    }
	    req.open(null, '/ajax/ajax', true);
	    req.send({selID: selID, selOpt:curValue});

    }
    
    if(selIDNum=='0' && curValue==''){
    	$('podbor-submit').style.display = 'none';
    }else if(selIDNum=='0' && curValue!=''){
    	$('podbor-submit').style.display = 'block';
    }
}