function isEmail(str) 

{ 

   var at="@" 

   var dot="." 

   var lat=str.indexOf(at) 

   var lstr=str.length 

   var ldot=str.indexOf(dot) 

   if (str.indexOf(at)==-1)                                       return false 

   if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)      return false 

   if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)   return false 

   if (str.indexOf(at,(lat+1))!=-1)                                 return false 

   if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)      return false 

   if (str.indexOf(dot,(lat+2))==-1)                                 return false 

   if (str.indexOf(" ")!=-1)                                       return false 

   return true                

}



function isEven(value)

{

	if (value%2 == 0)

		return true;

	else

		return false;

}



function confirmpopup(Message, url) { 

    var is_confirmed = confirm(Message);

    if (is_confirmed) 

	{

	   location.href = url;

    }

	else return is_confirmed;

} 





function hideControl(object_name)

{

	var obj = document.getElementById(object_name);

	if (obj != null)

	{

		//disableControl(object_name);

		obj.style.display = 'none';

	}

}



function showControl(object_name)

{

	var obj = document.getElementById(object_name);

	if (obj != null)

	{

		//enableControl(object_name);	

		obj.style.display = '';

	}

}



function disableControl(object_name)

{

	var obj = document.getElementById(object_name);

	if (obj != null)

	{

		obj.disabled = true;		

		//obj.style.background = '#E5E5E5';

	}

}



function enableControl(object_name)

{

	var obj = document.getElementById(object_name);

	if (obj != null)

	{

		obj.disabled = false;		

		//obj.style.background = '#ffffff';

	}

}



function getControl(object_name)

{

	return document.getElementById(object_name);

}



function findPosX(obj)

{

	var curleft = 0;

	if (obj.offsetParent)

	{

		while (obj.offsetParent)

		{

			curleft += obj.offsetLeft

			obj = obj.offsetParent;

		}

	}

	else if (obj.x)

	curleft += obj.x;

	return curleft;

}



function findPosY(obj)

{

	var curtop = 0;

	if (obj.offsetParent)

	{

		while (obj.offsetParent)

		{

			curtop += obj.offsetTop

			obj = obj.offsetParent;

		}

	}

	else if (obj.y)

		curtop += obj.y;

	return curtop;

}



// dit gaat ook niet lekker in firefox!

function addElement(objectName, title, value, selected)

{

	var object = document.getElementById(objectName);

	

	var option = document.createElement('option');

	var option = new Option(title,value,selected,selected);

	option.text = title;

	option.value = value;



	try 

	{

		object.add(option); // standards compliant; doesn't work in IE

	}

	catch(ex) 

	{

		object.add(option, null); // IE only

	}

}



function removeAllOptions(objectName)

{

	var obj = document.getElementById(objectName);

	

	if (obj!=null && obj.options!=null)

		document.getElementById(objectName).options.length = 0;

}



function newWindow(URL, height, width)

{

	var newWindow;



	var  myWin = "" ;

	var  x = screen.width ;

	var  y = screen.height ;

	var  top = parseInt( ( y - height ) / 2 ) ;

	var  left = parseInt( ( x - width  ) / 2 ) ;

	var  props = "scrollbars=yes,toolbars=no,status=no,resizable=no,width=" + width + ",height=" + height + ",left=" + left + ",top=" + top;





	newWindow = window.open(URL,"",props);

}