function validate_required(field,alerttxt){
	with (field){
		if (value==null||value==""||options[selectedIndex].value==""){
			alert(alerttxt);
			return false;
		}else{
			return true;
		}
	}
}

    function getItem(id)
    {
        var itm = false;
        if(document.getElementById)
            itm = document.getElementById(id);
        else if(document.all)
            itm = document.all[id];
        else if(document.layers)
            itm = document.layers[id];

        return itm;
    }

    function toggleItem(id)
    {
        itm = getItem(id);

        if(!itm)
            return false;

        if(itm.style.display == 'none')
            itm.style.display = '';
        else
            itm.style.display = 'none';

        return false;
    }
    
    function hideItem(id)
    {
        itm = getItem(id);

        if(!itm)
            return false;

        itm.style.display = 'none';

        return false;
    }
    
    function showItem(id)
    {
        itm = getItem(id);

        if(!itm)
            return false;

        itm.style.display = '';

        return false;
    }
    
    function highlight(id,color) {
        itm = getItem(id);

        if(!itm)
            return false;

        itm.style.backgroundColor = color;

        return false;
    }
    
    function setnav(){
    	hideItem('1');
    	hideItem('2');
    	hideItem('3');
    	hideItem('4');
    	hideItem('5');
    	hideItem('6');
    	hideItem('7');
    	hideItem('8');
    	hideItem('9');
    	hideItem('10');
    	hideItem('11');
    	hideItem('12');
    	hideItem('13');
    	hideItem('14');
    	hideItem('15');
    	hideItem('advanced_admin');
    }