function echeck(str) 
{
		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1)
		{
		   return false
		}

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

		else if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr)
		{
		    return false
		}

		else if (str.indexOf(at,(lat+1))!=-1)
		{
		    return false
		 }

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

		else if (str.indexOf(dot,(lat+2))==-1)
		{
		    return false
		 }
		
		else if (str.indexOf(" ")!=-1)
		{
		    return false
		 }
 		 return true					
	}




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