function get_file_contents(nav_id,nav_type) {
    var image_id = document.getElementById("image_id");    

    if(nav_type == "links") {
         image_id.value = nav_id;
         change_file(nav_id);          
         loadImage(nav_id);          
    } else {
         var choice = document.getElementById("choice");  
         choice.value = nav_id;

         img_id = parseInt(image_id.value);
         if(parseInt(nav_id) == 1)  {
            if(img_id < 11 ) {
              image_id.value = img_id + 1;                            
              change_file(image_id.value);              
              loadImage(image_id.value);                       
            }
         } else {
          
            if(img_id > 1 ) {
              image_id.value = img_id - 1;               
              change_file(image_id.value);        
              loadImage(image_id.value);                       
            }              
         }

    }
}

function loadImage(id) {
    var content_photo = document.getElementById("header_right_press_text");
    content_photo.innerHTML = "";
    var img = new Image();
    img.src = "images/" + id + ".jpg";
    content_photo.appendChild(img);    
}


http_request = false;

function change_file(page_id) {

	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType('text/html');
		}
	} else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	if (!http_request) {
		alert('Cannot create XMLHTTP instance');
		return false;
	}
	http_request.onreadystatechange = function() {
          if (http_request.readyState === 4) {  // Makes sure the document is ready to parse.
            if (http_request.status === 200) {  // Makes sure it's found the file.
              allText = http_request.responseText;
              //changeImageId();
              var content_press = document.getElementById("press_info");
              content_press.innerHTML = allText;
              return true;
            }
          }
	}
	url = "readFile.php?page_id="+page_id;
	http_request.open('GET', url, true);
	http_request.send(null);
}
	
function changeOverlay() {
    var disp = document.getElementById("nav_links1").style.display
    if(disp == "block") {
        document.getElementById("left_nav_img").src = "images/arrow.jpeg";
        document.getElementById("nav_links1").style.display = "none";
    } else {
        document.getElementById("nav_links1").style.display = "block";        
        document.getElementById("left_nav_img").src = "images/arrow_down.jpeg";            
    }
}

function changePageTo(page_id,type) {
    document.getElementById("header_right").className = "header_right_press";
    document.getElementById("left_nav").className = "left_nav_press";
    document.getElementById("content").className = "content_press";
    document.getElementById("main").className = "main_press";
    document.getElementById("main").style.backgroundColor = "white";
    document.getElementById("footer_nav").style.display = "block";
    document.getElementById("press_info").style.display = "block";
    document.getElementById("header_right_press_text").style.display = "block";
      
//    window.location.href = "press.html";
//    get_file_contents(page_id,type);
}

//function changeImageId() {
//    var choice = document.getElementById("choice"); 
//    var image_id = document.getElementById("image_id");    
//    img_id = parseInt(image_id.value);
//    
//    if(nav_type == "links") {
//         image_id.value = nav_id;
//    } else{    
//        if(parseInt(choice.value) == 1) {
//             image_id.value = img_id + 1;                 
//        }
//        else
//              image_id.value = img_id - 1;             
//    }
//}