function resetField()
{
	var arg = resetField.arguments, form = document.forms[ arg[0] ];
	if( form.elements[ arg[1] ].value == arg[2] )
	{
		form.elements[ arg[1] ].value = '';
	}
}

function estMail(ch)
{
    return ch.indexOf("@")!=-1 ? ch.substring(ch.indexOf("@")).indexOf(".")!=-1 : false ;
}

function checkform(id)
{
	
	var variable ="";
	if (document.forms['form'].nom.value.length!=0)
	{
		if (document.forms['form'].tel.value.length!=0)
		{
			if (estMail(document.forms['form'].email.value))
			{
				return true;
			}
			else
			{
				variable="'Email'";
			}
		}
		else
		{
			variable="'Tel'";
		}
	}
	else
	{
		if(id==1) variable="'Nom'";
		else  variable="'Name'";
	}
	if(id==1) window.alert ("le champs "+variable+" n'est pas correct ou vide !! Réessayez SVP !");
	else  window.alert ("Required field "+variable+" was empty or not valid !! Please retry !");
    return false;
}