function CustomAlert(){
	this.render = function(dialog){
		var winW = window.innerWidth;
		var winH = window.innerHeight;
		var dialogoverlay = document.getElementById('dialogoverlay');
		var dialogbox = document.getElementById('dialogbox');
		dialogoverlay.style.display = "block";
		dialogoverlay.style.height = winH+"px";
		dialogbox.style.left = (winW/2) - (550 * .5)+"px";
		dialogbox.style.top = "100px";
		dialogbox.style.display = "block";
		document.getElementById('dialogboxhead').innerHTML = "توجه !!";
		document.getElementById('dialogboxbody').innerHTML = dialog;
		document.getElementById('dialogboxfoot').innerHTML = '<button onclick="Alert.ok()" id="okBtn">بستن</button>';
		setTimeout( function() {document.getElementById('okBtn').focus()},100);		
	}
	this.ok = function(){
		document.getElementById('dialogbox').style.display = "none";
		document.getElementById('dialogoverlay').style.display = "none";
	}
}
  
var Alert = new CustomAlert();