function getObjById(id) 
{ 
	var obj;
	
    if (document.getElementById) 
    {
       obj = document.getElementById(id); 
    }
    else if (document.all) 
    {
        obj = document.all[id]; 
    }
    else if (document.layers) 
    {
        obj = document.layers[id];
    }
        
    return obj; 
}

function trapEnterKey(btnId, e)
{	
	var btn;
	var key;
		
	if (window.event)
	{
		key = e.keyCode;
    }
	else if (e.which)
	{
		key = e.which;
	}
		
	if (key == 13)
	{
		btn = getObjById(btnId);
		if (btn !== null)
		{
			e.returnValue = false;
			e.cancel = true;
			btn.click();
		}
	}
}