function changeimage(id,step) {
    if (id == 1) {
        if (step == 1) {
            document.getElementById('premium').src = "imagesN/CommonColor.jpg";
        }
        else if (step == 2)
            document.getElementById('premium').src = "imagesN/PremiumColor.jpg";
        
		}
    else if (id == 2) {
        if (step == 1)
            document.getElementById('super').src = "imagesN/CommonColor.jpg";
        else if (step == 2)
            document.getElementById('super').src = "imagesN/SuperColor.jpg";
       
    }
    else if (id == 3) {
        if (step == 1)
            document.getElementById('ultra').src = "imagesN/CommonColor.jpg";
        else if (step == 2)
            document.getElementById('ultra').src = "imagesN/UltraColor.jpg";
        
    }
	
	 else if (id == 4) {
        if (step == 1)
            document.getElementById('diesel').src = "imagesN/CommonColor.jpg";
        else if (step == 2)
            document.getElementById('diesel').src = "imagesN/Diesel.jpg";
        
    }
	
	 else if (id == 5) {
        if (step == 1)
            document.getElementById('kerosene').src = "imagesN/CommonColor.jpg";
        else if (step == 2)
            document.getElementById('kerosene').src = "imagesN/Kerosene.jpg";
        
    }
	
	 else if (id == 6) {
        if (step == 1)
            document.getElementById('eurodiesel').src = "imagesN/CommonColor.jpg";
        else if (step == 2)
            document.getElementById('eurodiesel').src = "imagesN/EuroDiesel.jpg";
        
    }
	
	 else if (id == 7) {
        if (step == 1)
            document.getElementById('eurogasoline').src = "imagesN/CommonColor2.jpg";
        else if (step == 2)
            document.getElementById('eurogasoline').src = "imagesN/EuroGasoline.jpg";
        
    }
    
    }