function Set_Cookie( name, value, expires, path, domain, secure )
{
// set time, it's in milliseconds
var today = new Date();
today.setTime( today.getTime() );

/*
if the expires variable is set, make the correct
expires time, the current script below will set
it for x number of days, to make it for hours,
delete * 24, for minutes, delete * 60 * 24
*/
if ( expires )
{
expires = expires * 1000 * 60 * 60 * 24;
}
var expires_date = new Date( today.getTime() + (expires) );

document.cookie = name + "=" +escape( value ) +
( ( expires ) ? ";expires=" + expires_date.toGMTString() : "" ) +
( ( path ) ? ";path=" + path : "" ) +
( ( domain ) ? ";domain=" + domain : "" ) +
( ( secure ) ? ";secure" : "" );
}


// this fixes an issue with the old method, ambiguous values
// with this test document.cookie.indexOf( name + "=" );
function Get_Cookie( check_name ) {
	// first we'll split this cookie up into name/value pairs
	// note: document.cookie only returns name=value, not the other components
	var a_all_cookies = document.cookie.split( ';' );
	var a_temp_cookie = '';
	var cookie_name = '';
	var cookie_value = '';
	var b_cookie_found = false; // set boolean t/f default f

	for ( i = 0; i < a_all_cookies.length; i++ )
	{
		// now we'll split apart each name=value pair
		a_temp_cookie = a_all_cookies[i].split( '=' );


		// and trim left/right whitespace while we're at it
		cookie_name = a_temp_cookie[0].replace(/^\s+|\s+$/g, '');

		// if the extracted name matches passed check_name
		if ( cookie_name == check_name )
		{
			b_cookie_found = true;
			// we need to handle case where cookie has no value but exists (no = sign, that is):
			if ( a_temp_cookie.length > 1 )
			{
				cookie_value = unescape( a_temp_cookie[1].replace(/^\s+|\s+$/g, '') );
			}
			// note that in cases where cookie is initialized but no value, null is returned
			return cookie_value;
			break;
		}
		a_temp_cookie = null;
		cookie_name = '';
	}
	if ( !b_cookie_found )
	{
		return null;
	}
}

function IsEmpty( txt )
{
	for( i=0; i < txt.length; i++)
	{
		switch (txt.charAt(i))
		{
		case '\n':
		case '\r':
		case ' ':
			continue;
		default:
			return false;
		}
	}
	return true;
}

function CheckEMail(email)
{
	if (trim(email) == '')
		return false;
	if (email.indexOf('@') == -1)
		return false;
	if (email.length < 4)
		return false;
	if (email.indexOf('@') != email.lastIndexOf('@'))
		return false;
	if (email.indexOf(' ') != -1)
		return false;
	return true;
}

function is_valid_email(address)
{
   var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9\-\.])+\.([A-Za-z]{2,6})$/;
   //var address = email_field.value;
   if(reg.test(address) == false) {
      //alert('Invalid Email Address');
      return false;
   }
   return true;
}

function preload_images( tablica )
{
	arr = new Array();
	var n = 0;

	for( i=0; i<tablica.length; ++i )
	{
		arr[n] = new Image();
		arr[n].src = tablica[i];
		//alert( tablica[i] );
		n++;
	}
}

function czek_buton( czek, buton )
{
	document.getElementById( buton ).disabled = !document.getElementById( czek ).checked;
}