// JavaScript Document
function obj(name)
{
	return document.getElementById(name);
}

function isDefined(variable)
{
	if(typeof(variable) !== 'undefined' && variable !== null)
		return true;
		
	return false;
}

/* Add options to a dropdown list */
function addOption(selectbox,text,value, selected )
{
	var optn = document.createElement("option");
	optn.text = text;
	optn.value = value;
	
	if (selected == null)
		optn.selected = false;
	else
		optn.selected = selected;
	
	selectbox.options.add(optn);
}

function clearSelectList(selectbox)
{
	selectbox.options.length = 0;
	return true;
}

function urldecode(psEncodeString)
{
  // Create a regular expression to search all +s in the string
  var lsRegExp = /\+/g;
  
  // Return the decoded string
  return unescape(String(psEncodeString).replace(lsRegExp, " "));
}

function updateMousePtr(state)
{
	document.body.style.cursor = state;
	return true;
}

function setOpacity(element, value) {
	//var object = document.getElementsByTagName("body")[0];
	//object.style.opacity = value/100;
	//object.style.filter = 'alpha(opacity=' + value + ')';
	var element = obj(element); 
	element.style.backgroundColor = '#000000';
	element.style.opacity = value/100;
	element.style.filter = 'alpha(opacity=' + value + ')';

	return true;
}

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 || 50;
  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';
  }
}

function searchSubmit()
{
	var searchForm = obj("searchForm");
	var searchText = obj("searchText").value;
	
	searchForm.action = "http://www.cruisecritic.co.uk/search/results.cfm?q=" + escape(searchText);
	
	return true;
}

function isNumeric(str) {

// Pull the regex out of the function and use test()
	//  instead of match() so that the regex is only
	//  compiled once, not on each call.
	var regExpr = /[^0-9]/;

    return !regExpr.test(str);
}

function checkemail(email) {
	
	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
	if (filter.test(email))
		return true;
	else {
		alert ("Please input a valid email address!");
		return false;
	}
}

function open_slideshow(SlideshowID)
// Opening slideshows in a new window
{
window.open("http://www.cruisecritic.co.uk/slideshows/?ID="+SlideshowID,"mywindow", "width=920,height=610,location=no,menubar=no,resizable=no,scrollbars=no,status=no,titlebar=yes,toolbar=no,left=0,top=0");
}

//expandCollapse
function expandCollapse() {
	for (var i=0; i<expandCollapse.arguments.length; i++) {
		var element = document.getElementById(expandCollapse.arguments[i]);
		element.style.display = (element.style.display == "none") ? "block" : "none";
	}
}