function eMailCheck(str) {



		var at="@"

		var dot="."

		var lat=str.indexOf(at)

		var lstr=str.length

		var ldot=str.indexOf(dot)

		if (str.indexOf(at)==-1){

		   alert("Địa chỉ email không hợp lệ");

		   return false

		}



		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){

		   alert("Địa chỉ email không hợp lệ")

		   return false

		}



		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){

		    alert("Địa chỉ email không hợp lệ")

		    return false

		}



		 if (str.indexOf(at,(lat+1))!=-1){

		    alert("Địa chỉ email không hợp lệ")

		    return false

		 }



		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){

		    alert("Địa chỉ email không hợp lệ")

		    return false

		 }



		 if (str.indexOf(dot,(lat+2))==-1){

		    alert("Địa chỉ email không hợp lệ")

		    return false

		 }

		

		 if (str.indexOf(" ")!=-1){

		    alert("Địa chỉ email không hợp lệ")

		    return false

		 }



 		 return true					

	}
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