// Langans Check form functions
function checkForm( form )
{
	var valid = false;
	// first check for blank fields
	valid = checkForBlankFields( form );
	if( !valid )
		alert( "Cannot submit form - please fill in all fields " );
	// next if all is well check valid email 
	if( valid )
		valid = echeck( form.email.value );	
	return valid;
}

function checkForBlankFields( form )
{
	var valid = true;
	for( var x = 0 ; x < form.elements.length ; x++ )
		if( form.elements[x].value == "" )
		{
			form.elements[x].focus();
			valid = false;	
		}
	return valid;
}

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					
	}