function flash_print(s) {
	document.writeln(s);
}

function change_class(obj_id,class_name) {
	var a = document.getElementById(obj_id);
	a.className = class_name;
}

function change_image(obj_id,src) {
	var a = document.getElementById(obj_id);
	a.src = 'images/menu/' + src;
}

function chk_email(obj) {
	apos = obj.value.indexOf("@");
	dotpos = obj.value.lastIndexOf(".");
	if (apos < 1 || dotpos - apos < 2) {
		alert('Please, fill a valid e-mail address.');
		obj.value = '';
		return false;
	}
	else return true;
}

function validate() {
	var inp = document.getElementsByTagName('input');
	var flag = 0;
	var msg = "";
	for (var i=0; i<inp.length; i++) {
		var ii = inp[i].getAttribute('id');
		if (ii == 'required' && inp[i].value == '') {
			var titlos = inp[i].getAttribute('title');
			msg = msg + titlos + "\n";
			flag++;
		}
	}
	var inp = document.getElementsByTagName('textarea');
	for (var i=0; i<inp.length; i++) {
		var ii = inp[i].getAttribute('id');
		if (ii == 'required' && inp[i].value == '') {
			var titlos = inp[i].getAttribute('title');
			msg = msg + titlos + "\n";
			flag++;
		}
	}
	if (flag > 0) {
		alert("Please, fill the required fields:\n" + msg);
		return(false);
	}
	else return(true);
}

function chgSize() {
	var obj = document.getElementById('big_foto_mask');
	if (document.body.offsetHeight > document.body.scrollHeight) var max = document.body.offsetHeight;
	else var max = document.body.scrollHeight;
	obj.style.height = max;
}

function maskOn(foto) {
	chgSize();
	oInterval = window.setInterval("chgSize()",1000);
	var obj = document.getElementById('big_foto_mask');
	obj.className = 'on';
	var obj = document.getElementById('big_pic_holder');
	obj.innerHTML = '<a href="javascript: maskOff();"><img src="' + foto + '" border="0" title="Click To Close" style="border: 4px solid #333333;"></a>';
	obj.className = 'on';
}

function maskOff() {
	window.clearInterval(oInterval);
	var obj = document.getElementById('big_foto_mask');
	obj.className = 'off';
	var obj = document.getElementById('big_pic_holder');
	obj.className = 'off';
}