function VerifySearch( event )
{
	form = document.getElementById( 'id_searchform' );	
	for( i=0; i<form.elements.length; i++ )
	{
		if( form.elements[i].type=="text" && form.elements[i].value.length < 1 )
		{
			alert( "You have to specify string to search!" );
			if (!event)
			{
				var event = window.event;
				event.returnValue = false;
			}

			event.cancelBubble = true;

			if( event.stopPropagation )
			{	
				event.stopPropagation();
			}
			return false;
		}
	}
	return true;
}

function VerifyEmptySearch( event )
{
	counter = 0;
	total = 0;
	form = document.getElementById( 'id_tracklist' );
	for( i=0; i<form.elements.length; i++ )
	{
		if( form.elements[i].type=="checkbox" )
		{
			total++;
			if( !form.elements[i].checked )
			{
				counter++;
			}
		}
	}

	if( counter == total )
	{	
		alert( "At least one track should be selected!" );
		
		if (!event)
		{
			var event = window.event;
			event.returnValue = false;
		}

		event.cancelBubble = true;

		if( event.stopPropagation )
		{	
			event.stopPropagation();
		}
		return false;
	    
	}
	return true;
}