// global variables //
var TIMER = 30;
var SPEED = 10;
var WRAPPER = 'content';


// calculate the current window width //
function pageWidth() {
  return window.innerWidth != null ? window.innerWidth : document.documentElement && document.documentElement.clientWidth ? document.documentElement.clientWidth : document.body != null ? document.body.clientWidth : null;
} //function


// calculate the current window height //
function pageHeight() {
  return window.innerHeight != null? window.innerHeight : document.documentElement && document.documentElement.clientHeight ? document.documentElement.clientHeight : document.body != null? document.body.clientHeight : null;
} //function


// calculate the current window vertical offset //
function topPosition() {
  return typeof window.pageYOffset != 'undefined' ? window.pageYOffset : document.documentElement && document.documentElement.scrollTop ? document.documentElement.scrollTop : document.body.scrollTop ? document.body.scrollTop : 0; 
} //function


// calculate the position starting at the left of the window //
function leftPosition() {
	return typeof window.pageXOffset != 'undefined' ? window.pageXOffset : document.documentElement && document.documentElement.scrollLeft ? document.documentElement.scrollLeft : document.body.scrollLeft ? document.body.scrollLeft : 0;
} //function


// build/show the dialog box, populate the data and call the fadeDialog function //
function showDialog(title,message,type,autohide) {
	if(!type) {
    	type = 'success';
  	}
  
	var dialog;
	var dialogheader;
	var dialogclose;
	var dialogtitle;
	var dialogcontent;
	var dialogmask;
	  
	if(!document.getElementById('dialog')) {
		dialog = document.createElement('div');
	    dialog.id = 'dialog';
	    dialogheader = document.createElement('div');
	    dialogheader.id = 'dialog-header';
	    dialogtitle = document.createElement('div');
	    dialogtitle.id = 'dialog-title';
	    dialogclose = document.createElement('div');
	    dialogclose.id = 'dialog-close'
	    dialogcontent = document.createElement('div');
	    dialogcontent.id = 'dialog-content';
	    dialogmask = document.createElement('div');
	    dialogmask.id = 'dialog-mask';
	    document.body.appendChild(dialogmask);
	    document.body.appendChild(dialog);
	    dialog.appendChild(dialogheader);
	    dialogheader.appendChild(dialogtitle);
	    dialogheader.appendChild(dialogclose);
	    dialog.appendChild(dialogcontent);;
	    dialogclose.setAttribute('onclick','hideDialog()');
	    dialogclose.onclick = hideDialog;
	} 
	else {
	    dialog = document.getElementById('dialog');
	    dialogheader = document.getElementById('dialog-header');
	    dialogtitle = document.getElementById('dialog-title');
	    dialogclose = document.getElementById('dialog-close');
	    dialogcontent = document.getElementById('dialog-content');
	    dialogmask = document.getElementById('dialog-mask');
	    dialogmask.style.visibility = "visible";
	    dialog.style.visibility = "visible";
	} //else
	  
	dialog.style.opacity = .00;
	dialog.style.filter = 'alpha(opacity=0)';
	dialog.alpha = 0;
	  
	var width = pageWidth();
	var height = pageHeight();
	var left = leftPosition();
	var top = topPosition();
	var dialogwidth = dialog.offsetWidth;
	var dialogheight = dialog.offsetHeight;
	var topposition = 10; //top + (height / 3) - (dialogheight / 2);
	var leftposition = left + (width / 2) - (dialogwidth / 2);
	dialog.style.top = topposition + "px";
	dialog.style.left = leftposition + "px";
	dialogheader.className = type + "header";
	dialogtitle.innerHTML = title;
	dialogcontent.className = type;
	dialogcontent.innerHTML = message;
	var content = document.getElementById(WRAPPER);
	dialogmask.style.height = content.offsetHeight + 'px';
	dialog.timer = setInterval("fadeDialog(1)", TIMER);
	if(autohide) {
		dialogclose.style.visibility = "hidden";
	    window.setTimeout("hideDialog()", (autohide * 1000));
	}  //if
	else {
		dialogclose.style.visibility = "visible";
	} //else
} //function


// hide the dialog box //
function hideDialog() {
  	var dialog = document.getElementById('dialog');
  	clearInterval(dialog.timer);
  	dialog.timer = setInterval("fadeDialog(0)", TIMER);
} //function


// fade-in the dialog box //
function fadeDialog(flag) {
	if(flag == null) {
    flag = 1;
}
	var dialog = document.getElementById('dialog');
  	var value;
  	if(flag == 1) {
	    value = dialog.alpha + SPEED;
  	} 
  	else {
	    value = dialog.alpha - SPEED;
  	}
  
  	dialog.alpha = value;
  	dialog.style.opacity = (value / 100);
  	dialog.style.filter = 'alpha(opacity=' + value + ')';
  	if(value >= 99) {
    	clearInterval(dialog.timer);
    	dialog.timer = null;
  	} 
  	else if(value <= 1) {
    	dialog.style.visibility = "hidden";
    	document.getElementById('dialog-mask').style.visibility = "hidden";
	    clearInterval(dialog.timer);
  	}
} //function