Hi,

As you are aware that when we delete a record, we get a pop-up (salesforce's standard functionality) which confirms that if we really want to delete the record.

However, if you delete a Task you don't get any pop-up. So we wanted to show the pop-up on task delete event as well.

I implemented this requirement by overriding the "Delete" button with a Visualforce page.

Within the visualforce made use of AJAX.

<apex:page standardController="Task">

<script type="text/javascript">
var __sfdcSessionId = '{!GETSESSIONID()}';
</script>

<script src="../../soap/ajax/20.0/connection.js" type="text/javascript"></script>

<script type="text/javascript">
window.onload = loadOnClick;

/*
Function Name : gup
Description: To get the value of a parameter in the URL
*/
function gup( name )
{ 
	name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]"); 
	var regexS = "[\\?&]"+name+"=([^&#]*)";  
	var regex = new RegExp(regexS );
	var results = regex.exec( window.location.href );  
	if( results == null )    
		return "";  
	else    
		return results[1];
}

/*
Function Name : gup
Description: Gets called on Delete button click. 
*/
function loadOnClick()
{     
	try{         
		var answer = confirm('Delete the Record?');         
		var taskRecordId = gup('delID');          
		if(answer)          
		{                       
			var delResult = sforce.connection.deleteIds([taskRecordId ]);               
			window.location='/home/home.jsp';          
		}else
		{                
			window.location='/'+taskRecordId;         
		}    
	}catch(err)
	{	
		alert(err);
	}
}

</script>

</apex:page>