function ValidarEmail(strEmail){ 
		var at="@";
		var dot=".";
		var lat=strEmail.indexOf(at);
		var lstr=strEmail.length;
		var ldot=strEmail.indexOf(dot);
	
		if (strEmail.indexOf(at)==-1) return false;
		if (strEmail.indexOf(at)==-1 || strEmail.indexOf(at)==0 || strEmail.indexOf(at)==lstr) return false;
		if (strEmail.indexOf(dot)==-1 || strEmail.indexOf(dot)==0 || strEmail.indexOf(dot)==lstr) return false;
		if (strEmail.indexOf(at,(lat+1))!=-1) return false;
		if (strEmail.substring(lat-1,lat)==dot || strEmail.substring(lat+1,lat+2)==dot) return false;
		if (strEmail.indexOf(dot,(lat+2))==-1) return false;
		if (strEmail.indexOf(" ")!=-1) return false;

    return true;
	}
	
	function validarLogin(){
			if (!ValidarEmail(document.form1.email.value)){
				alert('Email Inválido');
				return false;
			}
		
			return true;
	}
	
	function cargar(){
		if (getQueryVariable("loginError")!=undefined){
			alert('Usuario Inválido');
		}
	}