function clearLine(){
	//http://www.html5canvastutorials.com/advanced/html5-clear-canvas/

	var canv;
	for(var i = 0; i < SymexChartGlobals.tickers_qty; i++ ){
    canv = document.getElementById('price_' + i);
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
    
    canv = document.getElementById('price_SAR');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
  }
  if(SymexChartGlobals.display_BOL == 1){
    canv = document.getElementById('price_BOL');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();  
    canv = document.getElementById('price_BOL_nua');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();  
    canv = document.getElementById('price_SUP');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
    canv = document.getElementById('price_INF');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();  
  }
  if(SymexChartGlobals.display_STR == 1){
    canv = document.getElementById('price_STR');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();  
  } 
  if(SymexChartGlobals.display_KAMA == 1){
    canv = document.getElementById('price_KAMA');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();  
  }   
  if(SymexChartGlobals.ichi == 1){
    canv = document.getElementById('price_TENKAN');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
    
    canv = document.getElementById('price_KIJUN');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
    
    canv = document.getElementById('price_CHIKOU');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
    
    canv = document.getElementById('price_SENKOUA');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
    
    canv = document.getElementById('price_SENKOUB');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
    
    canv = document.getElementById('price_SENKOUSPAN');
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
  }
  for(var a=0,b=1;a<SymexChartGlobals.sub_chart.length ;a++,b++){
    canv = document.getElementById("chart"+ b+ "_0");
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
    
    canv = document.getElementById("chart"+ b+ "_1");
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    canv = document.getElementById("chart"+ b+ "_2");
    c = canv.getContext("2d");
    c.clearRect(0, 0, canv.width, canv.height);
    c.beginPath();
    jQuery('.labelsY_txt_chart_b').remove();
    jQuery('.labelsY_volume').remove();
  }
  canv = document.getElementById('paint_chart0');
  c = canv.getContext("2d");
  c.clearRect(0, 0, canv.width, canv.height);
  c.beginPath(); 

  jQuery('.labelsX_txt').remove();
  jQuery('.labelsX').remove();
  jQuery('.labelsX_rsi').remove();
  
  jQuery('.labelsY_txt').remove();
  jQuery('.labelsY').remove();
  jQuery('.pivot_line').remove();
  jQuery('.support_line').remove();
  jQuery('.resistance_line').remove();
  jQuery('.pivot_line_txt').remove();
  jQuery('.support_line_txt').remove();
  jQuery('.resistance_line_txt').remove();
  
  if ( SymexChartGlobals.display_news == 1 ) {
    jQuery('.triangle').remove();
  }
  if( SymexChartGlobals.display_signaux == 1 ) {
    jQuery('.triangle').remove();
    jQuery('.rectangle_red').remove();
    jQuery('.rectangle_green').remove();
    jQuery('.interrogation_pt').remove();
  }

  //reset step 'X' => need in case no data for selected period
  SymexChartGlobals.stepX = 0;

  //hide precission cell
  jQuery('#precCell').hide();
  jQuery('#precCellPointer').hide();
  for(var a=0,b=1;a<SymexChartGlobals.sub_chart.length ;a++,b++){
    jQuery("#precCellSC"+b).hide();
    jQuery("#precCellPointerSC"+b).hide();
  }
}