function Check_js() {

	var person = document.getElementById('_person');
    var submit = document.getElementById('subm');
	var index = new Array('city', 'name', 'rooms', 'phone', 'mail');
	var f1 = new Array('company', 'contact_name');
	var f2 = new Array('grown', 'children');

	for (var i=0; i<index.length; i++) {
		if (document.getElementById(index[i]).value == "") {
		    //alert(document.getElementById(index[i]).name);
		    submit.disabled = true;
			return -1;
		}
	}

	switch (person.value) {
		case 'juridical':
               for (var i=0; i<f1.length; i++) {
					if (document.getElementById(f1[i]).value == "") {
         				submit.disabled = true;
						return -1;
					}
				}
		break;
		case 'natural':
		       	for (var i=0; i<f2.length; i++) {
					if (document.getElementById(f2[i]).value == "") {
                        submit.disabled = true;
						return -1;
					}
				}
		break;
	}
	submit.disabled = false;
}

function switch_order (item) {
	var person = document.getElementById('_person');

	var yl = new Array();
	var fl = new Array();

	for (i=1; i<=5; i++) {
		yl[i] = document.getElementById(i);
		fl[i] = document.getElementById('1'+i);
	}

	var l1 = document.getElementById('link_order_1');
	var l2 = document.getElementById('link_order_2');
	if (item == 'order_1') {

    for (i=1; i<=5; i++) {
		yl[i].style.display = 'block';
		fl[i].style.display = 'none';
	}

		l1.className = 'item_link';
        l2.className = 'java_link';

        person.value = 'juridical';
	} else {

    for (i=1; i<=5; i++) {
		yl[i].style.display = 'none';
		fl[i].style.display = 'block';
	}

        l1.className = 'java_link';
        l2.className = 'item_link';

        person.value = 'natural';
	}
	
	Check_js()
}