// global variables //
var TIMER = 5;
var SPEED = 150;
var WRAPPER = 'body_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;
}

// 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;
}

// 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;
}

// 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;
}


// build/show the dialog box, populate the data and call the fadeDialog function //
function showDialog(title,message,type,w,h,autohide){
	if(!type) { type = 'error'; }
	Scroll_Hide('no_scroll');
	var xtrue = 0;
	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";
	}
	dialog.style.opacity = .00;
	dialog.style.filter = 'alpha(opacity=0)';
	dialog.alpha = 1;
	var width = pageWidth();
	var height = pageHeight();
	var left = leftPosition();
	var top = topPosition();
	var dialogwidth = dialog.offsetWidth;
	var dialogheight = dialog.offsetHeight;
	
	var w_alog = w;	
	var h_alog = h;
	var topposition = top + ( ((height) / 3) - (h_alog / 2) );
	var leftposition = left + ( ((width) / 2) - (w_alog / 1.5) );
	dialog.style.top = topposition + "px";
	dialog.style.left = leftposition + "px";
	
	dialogheader.className = type + "header";
	dialog.style.width = (w_alog)+"pt";
	dialog.style.height = (h_alog)+"px"; 	
	dialogheader.style.width = (w_alog-7.5)+"pt";		

	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));
	}else{
		dialogclose.style.visibility = "visible";
	}
}

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

// Hide Scroll //
function Scroll_Hide(n){
	if(n == "no_scroll"){ 
		document.body.scroll = "no";
		document.body.style.overflow = "hidden";
	}else{
		document.body.scroll = "yes";
		document.body.style.overflow = "";
	}	
}

// 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);
	}
}