function checkEmail(strEmail) {
	var at="@";
	var dot=".";
	var lat = strEmail.indexOf(at);
	var lstr = strEmail.length;
	var ldot = strEmail.indexOf(dot);
  var valid = true;

	if (strEmail.indexOf(at)==-1){
		valid = false;
	}

	if (strEmail.indexOf(at)==-1 || strEmail.indexOf(at)==0 || strEmail.indexOf(at)==lstr){
		valid = false;
	}

	if (strEmail.indexOf(dot)==-1 || strEmail.indexOf(dot)==0 || strEmail.indexOf(dot)==lstr){
		valid = false;
	}

	if (strEmail.indexOf(at,(lat+1))!=-1){
		valid = false;
	}

	if (strEmail.substring(lat-1,lat)==dot || strEmail.substring(lat+1,lat+2)==dot){
		valid = false;
	}

	if (strEmail.indexOf(dot,(lat+2))==-1){
		valid = false;
	}

	if (strEmail.indexOf(" ")!=-1){
		valid = false;
	}

	if(!valid) {
		return false;
	}

	return true;
}