Popup

Below code will helpful to create popup in liferay :

In Liferay 5 :

<portlet:renderURL var="somePageURL" windowState="<%= LiferayWindowState.POP_UP.toString() %>">
 <portlet:param name="jspPage" value="/jsp/some/page.jsp"/>
 <portlet:param name="redirect" value="<%= currentURL %>"/>
</portlet:renderURL>

<script>
function showPopup() {
  var popup = new Liferay.Popup({
    title: 'Popup Title',
    modal:true,
    width: 300,
    position:['center',30],
    url: '<%= somePageURL %>'
  });    
}
</script>
 <a href="javascript: showPopup(); ">Click here to open popup  </a>  

In Liferay 6 :

<portlet:renderURL var="somePageURL" windowState="<%= LiferayWindowState.EXCLUSIVE.toString() %>">
  <portlet:param name="jspPage" value="/jsp/some/page.jsp"/>
  <portlet:param name="redirect" value="<%= currentURL %>"/>
</portlet:renderURL> 
 <script type="text/javascript">
function showPopup() {
  AUI().use('aui-dialog', 'aui-io', 'event', 'event-custom', function(A) {
   
    var dialog = new A.Dialog({
            title: 'Popup Title',
            centered: true,
            draggable: true,
            modal: true
        }).plug(A.Plugin.IO, {uri: '<%= somePageURL %>'}).render();
       
        dialog.show();
       
  });
} 

Waiting ??????????   We are done with popup code!!!!