function $x(id){
    return document.getElementById(id);
}


function rangle(elt){
    if (!elt.checked){$x('roof_angle').style.display='none';}
    else $x('roof_angle').style.display='';    
}

var mansarda    = new Array('parodifmem','uteplitel','parizolmem');
mansarda_active = new Array('membrana','osnovanie','parodifmem','uteplitel','parizolmem');
var cherdak     = new Array('');
var add_params  = new Array('ventsneg','fartuk','vodostok');

function select_mansarda(){
    $x('mansarda').checked = true;
    mansarda_active.each(function(id){
        $x(id).disabled = false;    
    });
    check_addparams();
}




function select_cherdak(){
    mansarda.each(function(id){
        $x(id).checked=false;
        $x(id).disabled=true;
    });

    check_addparams();    
}

function check_addparams(){
      var a = $x('mansarda').checked;
      var b = $x('cherdak').checked ; 
     if($x('cherdak').checked){ 
        var bool = ($x('membrana').checked && $x('osnovanie').checked);
        add_params.each(function(id){
            if (!bool){ 
                $x(id).checked  =   false;
                $x(id).disabled =   true;
            }
            else {
                $x(id).disabled = false;
            }
            
        });
     };
     
     if ($x('mansarda').checked) {
        var bool = ($x('membrana').checked && $x('osnovanie').checked && $x('parodifmem').checked && $x('uteplitel').checked && $x('parizolmem').checked );
        
            add_params.each(function(id){
                if (bool){
                    $x(id).disabled=false;
                }
                else {
                    $x(id).checked=false;
                    $x(id).disabled=true;
                }
            });
     
     }
     
}

function num(elt){
    return parseFloat(elt.value);
}

function getvalue(elt){
        var a = elt;
        for (var i=0;i<a.length;i++){
            if (a[i].checked) {
                var cost = a[i].value;
            }
        }
        return parseFloat(cost);
}




$x('ch_1').checked = true;

function calculate_price(){
    if (!$x('square').value){
        $x('square').style.border = 'solid red 1px';
        $x('square').focus();
        return false;
    }
    else{
        square  = num($x('square'));
        ppsqm   = getvalue($x('roof').model);
        diff    = getvalue($x('roof').roof_diff);
        price = square*ppsqm*diff;
        if ($x('membrana').checked){
            angle   = getvalue($x('roof').angle);
            price = price + angle*num($x('membrana'))*square;
        }
        if ($x('osnovanie').checked){
            price = price + num($x('osnovanie'))*square;
        }
        if ($x('parodifmem').checked){
            price = price + num($x('parodifmem'))*square;
        }
        if ($x('uteplitel').checked){
            utepl_coeff = num($x('utepl_coeff'));
            price = price + num($x('uteplitel'))*utepl_coeff*square;
        }
        if ($x('parizolmem').checked){
            price = price + num($x('parizolmem'))*square;
        }
        if ($x('ventsneg').checked){
            price = price + num($x('ventsneg'))*square;
        }
        if ($x('fartuk').checked){
            price = price + num($x('fartuk'))*square;
        }
        if ($x('vodostok').checked){
            price = price + num($x('vodostok'))*square;
        }               
        var ppm = Math.ceil(price/square);
        $x('price').value=Math.ceil(price); 
	$x('pricepm').value=ppm; 
	void(0);
    }
    

}




select_mansarda();