function PurchaseTracks()
{	
    isTrackSelected = false;
    
	form = document.getElementById( 'id_icartform' );
	for( i=0; i<form.elements.length; i++ )
	{
		if( form.elements[i].type=="checkbox" )
		{			
			if( form.elements[i].checked )
			{
				isTrackSelected = true;
                break;
			}
		}
	}
    
    if( !isTrackSelected )
	{
        alert("Please, select one or more tracks for purchase!");        
		return ;
	}  
	
	form.iaction.value = 1;
	form.submit();
	return true;
}


function DeleteTracks()
{
    isTrackSelected = false;
    
	form = document.getElementById('id_icartform');
	for( i = 0; i < form.elements.length; i++ )
	{
		if( form.elements[i].type=="checkbox" )
		{			
			if( form.elements[i].checked )
			{
				isTrackSelected = true;
                break;
			}
		}
	}

	if( !isTrackSelected )
	{		
        alert("Please, select tracks for deleting!");        
		return ;
	}
	form.iaction.value = 0;
	form.submit();
	return true;
}

function AddTracksShopingCart()
{
    isTrackSelected = false;
    isRegisteredUser = false;    
    
	form = document.getElementById( 'id_addform' );
	for( i = 0; i < form.elements.length; i++ )
	{
		if( form.elements[i].type=="checkbox" )
		{			
			if( form.elements[i].checked )
			{
				isTrackSelected = true;
                break;
			}
		}
	} 
    
	if( !isTrackSelected )
	{
        alert("Please, select tracks for shoping cart!");        
		return false;
	}    
    
	form.iaction.value = 2;
	form.submit();
	return true;
}

function AddTracks(id)
{
    isTrackSelected = false;       
    
	form = document.getElementById(id);
	for( i = 0; i < form.elements.length; i++ )
	{
		if( form.elements[i].type=="checkbox" )
		{			
			if( form.elements[i].checked )
			{
				isTrackSelected = true;
                break;
			}
		}
	} 
    
	if( !isTrackSelected )
	{
        alert("Please, select tracks for shoping cart!");        
		return ;
	}
	
	form.submit();
	return true;
}

var check = false;

function SelectTracks(id)
{
	form = document.getElementById( id );
	for( i = 0; i < form.elements.length; i++ )
	{
		if( form.elements[i].type=="checkbox" )
		{
            if( check ){
                form.elements[i].checked = false;
            }else{
                form.elements[i].checked = true;
            }
		}
	}
	check = !check;	
	return ;
}