var oke = "#D6FED4";
var wrong = "#FDC6C6";
var blank = "";

function check_email(object) {
		var str = object.value;
		var at="@";
		var dot=".";
		var lat=str.indexOf(at);
		var lstr=str.length;
		var ldot=str.indexOf(dot);
		if(str.length == 0){colorize(object,blank); return false;}
		if (str.indexOf(at)==-1){colorize(object,wrong); return false;}
		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){colorize(object,wrong); return false;}
		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){colorize(object,wrong); return false;}
	 	if (str.indexOf(at,(lat+1))!=-1){colorize(object,wrong); return false;}
		if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){colorize(object,wrong); return false;}
		if (str.indexOf(dot,(lat+2))==-1){colorize(object,wrong); return false;}
		if (str.indexOf(" ")!=-1){colorize(object,wrong); return false;}
		colorize(object,oke);		
		return true;
}

function colorize(object,color){
	object.style.backgroundColor = color;
}