function checkVal()
{
	
	if(!document.getElementById("author").value)
	{
		alertMessage('Please enter name!');
		document.getElementById("author").focus();
		return false;
	}
	if(!document.getElementById("email").value)
	{
		alertMessage('Please enter email!');
		document.getElementById("email").focus();
		return false;
	}
	if(!document.getElementById("comment").value)
	{
		alertMessage('Please enter comment!');
		document.getElementById("comment").focus();
		return false;
	}

}
function alertMessage(msg)
{
		var path=document.getElementById("path").value;
		Modalbox.show('<div class=\'warning\'><img src='+path+' align=absmiddle> '+msg+'<br><input type=\'button\' value=\'OK\'onclick=\'Modalbox.hide()\' class=\'button_class\'  /> </div>',{title: 'WARNING', width: 230});
}