function echeck(str)
{
	var at="@"
	var dot="."
	var lat=str.indexOf(at)
	var lstr=str.length
	var ldot=str.indexOf(dot)
	if (str.indexOf(at)==-1)
	{
	   //alert("Invalid E-mail ID")
	   return false
	}
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr)
	{
	  // alert("Invalid E-mail ID")
	   return false
	}
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)
	{
	   // alert("Invalid E-mail ID")
	    return false
	}
	if (str.indexOf(at,(lat+1))!=-1)
	{
	    //alert("Invalid E-mail ID")
	    return false
	}
	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot)
	{
	   // alert("Invalid E-mail ID")
	    return false
	}
	if (str.indexOf(dot,(lat+2))==-1)
	{
	   // alert("Invalid E-mail ID")
	    return false
	}
	if (str.indexOf(" ")!=-1)
	{
	   // alert("Invalid E-mail ID")
	    return false
	}
 	return true					
}

function validateMainBook(car){
	
	var valid = true;
	var msg = '';
	
	if(document.getElementById('txtSurname').value == '' || document.getElementById('txtSurname').value == null)
	{
		valid = false;
		document.getElementById('Surname').innerHTML = '<strong><font color="#ffa803">Surname*</font><strong>';
		msg = msg + '- Surname\n';
	}
	else
	{
		document.getElementById('Surname').innerHTML = 'Surname*';
	}
	
	
	
	if(document.getElementById('txtEmail').value == '' || document.getElementById('txtEmail').value == null)
	{
		valid = false;
		document.getElementById('email').innerHTML = '<strong><font color="#ffa803">E-mail*</font><strong>';
		msg = msg + '- Email Address\n';
	}
	else if(echeck(document.getElementById('txtEmail').value) == false)
	{
		valid = false;
		document.getElementById('email').innerHTML = '<strong><font color="#ffa803">E-mail*</font><strong>';
		msg = msg + '- Valid Email Address\n';
	}
	else
	{
		document.getElementById('email').innerHTML = 'E-mail*';
	}
		

	if(valid == false)
	{
		alert('Please fill the following fields:\n' + msg);
		return false;
	}
	else 
	{
		return true;
	}
}