jQuery.fn.shake = function(intShakes /*Amount of shakes*/, intDistance /*Shake distance*/, intDuration /*Time duration*/) {  
  this.each(function() {  
    $(this).css({position:'relative'});  
    for (var x=1; x<=intShakes; x++) {  
      $(this).animate({left:(intDistance*-1)}, (((intDuration/intShakes)/4)))  
      .animate({left:intDistance}, ((intDuration/intShakes)/2))  
      .animate({left:0}, (((intDuration/intShakes)/4)));  
    }  
  });  
  return this;  
};  

/*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};
		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){return false};
		if (str.indexOf(at,(lat+1))!=-1){return false};
		if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){return false}
		if (str.indexOf(dot,(lat+2))==-1){return false};
		if (str.indexOf(" ")!=-1){return false};
		return true					
}*/