function switch_product_view(idVal,new_image) {
	
	
	
	//find all links on the page
	var dead_links = document.getElementsByTagName("a")
	
	//loop through
	for(var i=0; i < dead_links.length; i++) {

		var kill_link = dead_links[i];
     	var link_class = kill_link.className;
		
		
		
		// find all the links of the required class
		if (link_class.indexOf('product_view_thumb') !=-1) {	
			
			//set their display class to the default setting
			kill_link.className = "product_view_thumb";
		}
		
		
	}
	
	//locate the sub_div required
	var display_object = document.getElementById("main_image");
	
	display_object.src = new_image;
	
	//locate the sub_link required
	var sub_link = document.getElementById(idVal)
	
	//set sub_link to the selected class
	sub_link.className = sub_link.className + " selected";
}