function check_left_buttons() {
	
		var front_wheel_select_count = 0 ;
		var rear_wheel_select_count = 0 ;
		for (var i = 0; i < parts.length; i++) 
		{
			
			if ( (parts[i]["Tech_Name"].substring(0,10) != 'frontwheel') && (parts[i]["Tech_Name"].substring(0,9) != 'rearwheel'))
			{ // No front and rear wheel
				if (parts[i]["ID"] != -1) 
					{
						document.getElementById('left_button_'+parts[i]["Tech_Name"]).innerHTML = '<span style="vertical-align:middle;">' + parts[i]["Name"] + '</span> <img src="imgs/left_button_ok.gif" style="vertical-align:middle;">' ;
					}
				else
					{
						document.getElementById('left_button_'+parts[i]["Tech_Name"]).innerHTML = parts[i]["Name"] + "" ;
					}
			}
			else
			{ // Check front and rear wheel
					
					if ( parts[i]["Tech_Name"].substring(0,10) == 'frontwheel' )
						{ // The Frontwheel
							if (front_wheel_buttons_visible == true)
								{ // Buttons visible
									if (parts[i]["ID"] != -1) 
										{
											document.getElementById('left_button_'+parts[i]["Tech_Name"]).innerHTML = '<span style="vertical-align:middle;">' + parts[i]["Name"] + '</span> <img src="imgs/left_button_ok.gif" style="vertical-align:middle;">' ;
											front_wheel_select_count++ ;
										}
									else
										{
											document.getElementById('left_button_'+parts[i]["Tech_Name"]).innerHTML = parts[i]["Name"] + "" ;
										}
								}
							else
								{ // Buttons invisible
									if (parts[i]["ID"] != -1) 
										{ //Increase only counter
											front_wheel_select_count++ ;
										}
								}								
						}
						
					if ( parts[i]["Tech_Name"].substring(0,9) == 'rearwheel' )
						{ // The Rearwheel
							if (rear_wheel_buttons_visible == true)
								{ // Buttons visible
									if (parts[i]["ID"] != -1) 
										{
											document.getElementById('left_button_'+parts[i]["Tech_Name"]).innerHTML = '<span style="vertical-align:middle;">' +parts[i]["Name"] + '</span> <img src="imgs/left_button_ok.gif" style="vertical-align:middle;">'	;
											rear_wheel_select_count++ ;
										}
									else
										{
											document.getElementById('left_button_'+parts[i]["Tech_Name"]).innerHTML = parts[i]["Name"] + "" ;
										}
								}
							else
								{ // Buttons invisible
									if (parts[i]["ID"] != -1) 
										{ //Increase only counter
											rear_wheel_select_count++ ;
										}
								}
						}
			}
		}
		
	if (front_wheel_select_count == 5)
		{
			document.getElementById('left_button_frontwheel').innerHTML = '<span style="vertical-align:middle;">Front Wheel</span> <img src="imgs/left_button_ok.gif" style="vertical-align:middle;">' ;
		}
	
	if (rear_wheel_select_count == 5)
		{
			document.getElementById('left_button_rearwheel').innerHTML = '<span style="vertical-align:middle;">Rear Wheel</span> <img src="imgs/left_button_ok.gif" style="vertical-align:middle;">' ;
		}
  	}