var rURL = '/calc.php';
    var READY_STATE_COMPLETE=4

    function getHTTPRequestObject() {
        var xmlHttpRequest;
        if (typeof ActiveXObject != 'undefined') {
            xmlHttpRequest = new ActiveXObject('Microsoft.XMLHTTP');
        } else if (typeof XMLHttpRequest != 'undefined') {
            xmlHttpRequest = new XMLHttpRequest();
        } else {
            xmlHttpRequest = false;
        }
        return xmlHttpRequest;
    }

    var httpRequester = getHTTPRequestObject(); //Рабочий экземпляр класса XMLHttpRequest

    //выполняет асинхронный GET
    function makeAJAXCall(ajaxUrl){
        if (httpRequester) {
            httpRequester.open("GET", ajaxUrl, true);
            httpRequester.onreadystatechange = processResponse;
            httpRequester.send(null);
        }
/*location.href=ajaxUrl;*/
    }
    function processResponse() {
        if (httpRequester.readyState == READY_STATE_COMPLETE) {
            if (httpRequester.status==200) {
                printToPage ("<font color=\"blue\">"+httpRequester.responseText+"</font>", 'calc_area');
                document.getElementById('status_area').style.display = 'none';
            } else {
                var message = "Problem retrieving data. requestStatus="+httpRequester.status+". Message="+httpRequester.statusText;
                printToPage ("<font color=\"red\">"+message+"</font>");
            }
        }
    }

    //Выводим переданный HTML в элемент с id="result"
    function printToPage(value, id){
	if(!id) id = 'status_area';
        resultDiv = document.getElementById(id);
        resultDiv.innerHTML = value;
	resultDiv.style.display = '';
    }

    function openCalc()
    {
		//alert(document.getElementById('calc_area'));
		var calc_area = document.getElementById('calc_area');
        if(calc_area)
        {
            if(calc_area.style.display=='none')
            {
                makeRequest();
                calc_area.style.display = '';
            }
            else calc_area.style.display = 'none';
        }
    }

    function makeRequest(UrlToGo)
    {
        printToPage ("<font color=\"blue\">Отправляется зарпос к серверу...</font>");
        makeAJAXCall(rURL+(UrlToGo && UrlToGo.length>0?'?'+UrlToGo:''));
    }
    
    
	function makeCalculations1()
	{
		var ar_fields = Array('section', 'mark', 'width', 'length', 'thickness', 'count');
		var loc_string = 'calculate1=yes';
		for(fname in ar_fields)
		{
			if(elem=document.getElementById(ar_fields[fname])) loc_string = loc_string+'&'+elem.name+'='+elem.value;
		}
		makeRequest(loc_string);
	}
	function makeCalculations2()
	{
		var ar_fields = Array('section', 'mark', 'width1', 'length1', 'parameter1', 'parameter', 'thickness1', 'count', 'weight1', 'size1', 'size2');
		var loc_string = 'calculate2=yes';
		for(fname in ar_fields)
		{
			if(elem=document.getElementById(ar_fields[fname])) loc_string = loc_string+'&'+elem.name+'='+elem.value;
		}
		makeRequest(loc_string);
	}

	function changeParameter(name_val, param_id)
	{
		if(inp=document.getElementById(param_id)) inp.name = name_val;
	}
	function changeParameter1(name_val, param_id)
	{
		if(inp=document.getElementById(param_id)) inp.name = name_val;
	}

	function changeSection(section, just_loaded)
	{
		//alert('yes');
		if(section=='list') value = 'Ширина';
		else value = 'Диаметр';
		if(elem=document.getElementById('label_width')) elem.innerHTML = value;
		if(div_lc=document.getElementById('list_params')) div_lc.style.display = section=='list' ? '' : 'none';

		var ar_width = Array();
		var ar_length = Array();
		var ar_marks = Array();
				ar_width['circle'] = Array();
		ar_length['circle'] = Array();
		ar_width['list'] = Array();
		ar_length['list'] = Array();
		ar_width['square'] = Array();
		ar_length['square'] = Array();
		ar_width['six'] = Array();
		ar_length['six'] = Array();
		if(!just_loaded)
		{
			if(width_section=document.getElementById("width"))
			{
				while(width_section.childNodes.length>0) width_section.removeChild(width_section.lastChild);
				for(i in ar_width[section])
				{
					var option = document.createElement("option");
					option.value = ar_width[section][i];
					option.innerHTML = ar_width[section][i];
					width_section.appendChild(option);
				}
			}
			if(length_section=document.getElementById("length"))
			{
				while(length_section.childNodes.length>0) length_section.removeChild(length_section.lastChild);
				for(i in ar_length[section])
				{
					var option = document.createElement("option");
					option.value = ar_length[section][i];
					option.innerHTML = ar_length[section][i];
					length_section.appendChild(option);
				}
			}
			s
			if(section_marks=document.getElementById("mark"))
			{
				while(section_marks.childNodes.length>0) section_marks.removeChild(section_marks.lastChild);
				for(i in ar_marks[section])
				{
					var option = document.createElement("option");
					option.value = i;
					option.innerHTML = ar_marks[section][i];
					section_marks.appendChild(option);
				}
			}
		}
	}
	
	//changeSection('circle', true);