//FUNCION PARA VALIDAR MAIL

	function email_valido(email)
	{
		var i;
		var cStrCont,cStrDot;
		i = 0;
		cStrCont = 0;
		cStrDot = 0;

		for ( i=0; i < email.length ; i++ )
		{
			if ( email.charAt(i) == "@" )
			{
				cStrCont = cStrCont + 1
			}
			if ( email.charAt(i) == "." )
			{
				cStrDot = cStrDot + 1
			}
		}

		if (cStrCont != 1 || cStrDot == 0)
		{
			return false;
		}
		if ( email.charAt(email.length - 1 ) == "." )
		{
			return false;
		}
		return true;
	}


//FUNCION PARA VALIDAR FORMULARIOS
function form_valido(form)
{  
		if(form == "formSubs")
		{
			//VALIDAR E-MAIL
			if (!email_valido(window.document.formSubs.email.value)){
				alert('Por favor ingrese su email, (Ej. sucuenta@dominio.com)');
				document.formSubs.email.focus();
				return false;
			}
		}		
} //form_Valido
<script>

function Enviar(){
	formulario = document.forms["frmBol"]
	formulario.submit()
}
</script>