var lastMenu = 0;
var bigPicLoaded = false;

function sure(url) {
	if (confirm("Are you sure?")) document.location.href = url;	
}

function hilite(obj, state) {
	obj.style.backgroundColor = state ? "#e0e0e0" : "";	
}


function hideBig() {
	obj = document.getElementById("largePhoto");
	obj.style.visibility='hidden';
	grayOut(false);
}

function showBig(photoId,cat) {
	if (!cat) cat = "media";
	grayOut(true);
	obj = document.getElementById("largePhoto");
	obj.style.top = f_scrollTop();
	obj.innerHTML = "<div id=loading><img src=miscpics/icons/loadingtrans.gif></div>";
	if (!bigPicLoaded) {
		frameSize = getFrameWidth();
		if (frameSize[0] && frameSize[1]) {
			obj.style.marginTop = Math.floor((frameSize[1]-100)/2);
			obj.style.marginTop = Math.floor((frameSize[1]-100)/2);
		}
	}
	obj.style.visibility = "visible";
	
	if (!bigPicLoaded) {
		photoWidth = 800;
		photoHeight = 600;
		
		newPhoto = new Image();
		newPhoto.src = "showPhoto.php?photoId=" + photoId + "&cat="+cat+"&width="+photoWidth+"&height="+photoHeight;
		
		newPhoto.onload = function() {
			obj = document.getElementById("largePhoto");
			obj.innerHTML = "";
			obj.appendChild(this);
			obj.style.visibility = "visible";
			//bigPicLoaded = true;
					
			frameSize = getFrameWidth();
			
			if (frameSize[0] && frameSize[1]) {
				obj.style.marginTop = Math.floor((frameSize[1]-this.height)/2);
				obj.style.marginTop = Math.floor((frameSize[1]-this.height)/2);
			}
		}
		
	}
	//obj.innerHTML = "<img src=showPhoto.php?photoId=" + photoId + "&width="+photoWidth+"&height="+photoHeight+">";
}

function toggleDisp(objId) {
	document.getElementById(objId).style.display = document.getElementById(objId).style.display == "block" ? "none" : "block";
}

function getFrameWidth() {
	if (self.innerWidth) {
		frameWidth = self.innerWidth;
		frameHeight = self.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientWidth) {
		frameWidth = document.documentElement.clientWidth;
		frameHeight = document.documentElement.clientHeight;
	}
	else if (document.body) {
		frameWidth = document.body.clientWidth;
		frameHeight = document.body.clientHeight;
	}
	retval = new Array(frameWidth, frameHeight);
	
	return retval;
}

function f_scrollTop() {
	return f_filterResults (
		window.pageYOffset ? window.pageYOffset : 0,
		document.documentElement ? document.documentElement.scrollTop : 0,
		document.body ? document.body.scrollTop : 0
	);
}
function f_filterResults(n_win, n_docel, n_body) {
	var n_result = n_win ? n_win : 0;
	if (n_docel && (!n_result || (n_result > n_docel)))
		n_result = n_docel;
	return n_body && (!n_result || (n_result > n_body)) ? n_body : n_result;
}


function grayOut(vis, options) {
  // Pass true to gray out screen, false to ungray
  // options are optional.  This is a JSON object with the following (optional) properties
  // opacity:0-100         // Lower number = less grayout higher = more of a blackout 
  // zindex: #             // HTML elements with a higher zindex appear on top of the gray out
  // bgcolor: (#xxxxxx)    // Standard RGB Hex color code
  // grayOut(true, {'zindex':'50', 'bgcolor':'#0000FF', 'opacity':'70'});
  // Because options is JSON opacity/zindex/bgcolor are all optional and can appear
  // in any order.  Pass only the properties you need to set.
  var options = options || {}; 
  var zindex = options.zindex || 2;
  var opacity = options.opacity || 70;
  var opaque = (opacity / 100);
  var bgcolor = options.bgcolor || '#000000';
  var dark=document.getElementById('darkenScreenObject');
  if (!dark) {
    // The dark layer doesn't exist, it's never been created.  So we'll
    // create it here and apply some basic styles.
    // If you are getting errors in IE see: http://support.microsoft.com/default.aspx/kb/927917
    var tbody = document.getElementsByTagName("body")[0];
    var tnode = document.createElement('div');           // Create the layer.
        tnode.style.position='absolute';                 // Position absolutely
        tnode.style.top='0px';                           // In the top
        tnode.style.left='0px';                          // Left corner of the page
        tnode.style.overflow='hidden';                   // Try to avoid making scroll bars            
        tnode.style.display='none';                      // Start out Hidden
        tnode.id='darkenScreenObject';                   // Name it so we can find it later
    tbody.appendChild(tnode);                            // Add it to the web page
    dark=document.getElementById('darkenScreenObject');  // Get the object.
  }
  if (vis) {
    // Calculate the page width and height 
    if( document.body && ( document.body.scrollWidth || document.body.scrollHeight ) ) {
        var pageWidth = document.body.scrollWidth+'px';
        var pageHeight = document.body.scrollHeight+'px';
    } else if( document.body.offsetWidth ) {
      var pageWidth = document.body.offsetWidth+'px';
      var pageHeight = document.body.offsetHeight+'px';
    } else {
       var pageWidth='100%';
       var pageHeight='100%';
    }   
    //set the shader to cover the entire page and make it visible.
    dark.style.opacity=opaque;                      
    dark.style.MozOpacity=opaque;                   
    dark.style.filter='alpha(opacity='+opacity+')'; 
    dark.style.zIndex=zindex;        
    dark.style.backgroundColor=bgcolor;  
    dark.style.width= pageWidth;
    dark.style.height= pageHeight;
    dark.style.display='block';                          
  } else {
     dark.style.display='none';
  }
}