function swapMainImage(small_image) {
		
		var small_img1 ='', small_img2 ='';
		
		//alert("the_box = " + small_image)
		
		file_ext 	= small_image.substring(small_image.indexOf("."), (small_image.indexOf(".") + 4));	
		img_num 	= small_image.substring(small_image.indexOf("."), (small_image.indexOf(".") - 1));
		start_str	= small_image.substring((small_image.indexOf(".") - 1), 0);
		
		img_1_start_pos = (document.mainBox.src.lastIndexOf("/") + 1)
		img_1_full_str	= document.mainBox.src.substring(img_1_start_pos, document.mainBox.src.length);

		img1_file_ext 	= img_1_full_str.substring(img_1_full_str.indexOf("."), (img_1_full_str.indexOf(".") + 4));	
		img1_img_num 	= img_1_full_str.substring(img_1_full_str.indexOf("."), (img_1_full_str.indexOf(".") - 1));
		img1_start_str	= img_1_full_str.substring((img_1_full_str.indexOf(".") - 1), 0);

		img_2_start_pos = (document.small_img1.src.lastIndexOf("/") + 1)
		img_2_full_str	= document.small_img1.src.substring(img_2_start_pos, document.small_img1.src.length);

		img2_file_ext 	= img_2_full_str.substring(img_2_full_str.indexOf("."), (img_2_full_str.indexOf(".") + 4));	
		img2_img_num 	= img_2_full_str.substring(img_2_full_str.indexOf("."), (img_2_full_str.indexOf(".") - 1));
		img2_start_str	= img_2_full_str.substring((img_2_full_str.indexOf(".") - 1), 0);
		
		img_3_start_pos = (document.small_img2.src.lastIndexOf("/") + 1)
		img_3_full_str	= document.small_img2.src.substring(img_3_start_pos, document.small_img2.src.length);

		img3_file_ext 	= img_3_full_str.substring(img_3_full_str.indexOf("."), (img_3_full_str.indexOf(".") + 4));	
		img3_img_num 	= img_3_full_str.substring(img_3_full_str.indexOf("."), (img_3_full_str.indexOf(".") - 1));
		img3_start_str	= img_3_full_str.substring((img_3_full_str.indexOf(".") - 1), 0);		 
			
		small_img1  = document.small_img1.src
		small_img2  = document.small_img1.src
		
		if (img_num=='2') {
		
			document.mainBox.src='images/products/full/' + img2_start_str + img2_img_num + img2_file_ext
			document.small_img1.src='images/products/smalls/' + img1_start_str + img1_img_num + img1_file_ext
			document.small_img2.src='images/products/smalls/' + img3_start_str + img3_img_num + img3_file_ext
		
		}
		else if (img_num=='3') {
		
			document.mainBox.src='images/products/full/' + img3_start_str + img3_img_num + img3_file_ext
			document.small_img1.src='images/products/smalls/' + img1_start_str + img1_img_num + img1_file_ext
			document.small_img2.src='images/products/smalls/' + img2_start_str + img2_img_num + img2_file_ext			 					
		}
	}