diff --git a/themes/default/js/tools/statesManagement.js b/themes/default/js/tools/statesManagement.js
index 26c1e6468..683893d64 100644
--- a/themes/default/js/tools/statesManagement.js
+++ b/themes/default/js/tools/statesManagement.js
@@ -11,14 +11,14 @@ function bindStateInputAndUpdate()
 		updateZipCode();
 	});
 	
-	if ($('select#id_country_invoice').length != 0)
+	if ($('select#id_country_invoice').length !== 0)
 	{
 		$('select#id_country_invoice').change(function(){
 			updateState('invoice');
 			updateNeedIDNumber('invoice');
 			updateZipCode();
 		});
-		if ($('select#id_country_invoice:visible').length != 0)
+		if ($('select#id_country_invoice:visible').length !== 0)
 		{
 			updateState('invoice');
 			updateNeedIDNumber('invoice');
@@ -35,10 +35,10 @@ function updateState(suffix)
 {
 	$('select#id_state'+(suffix !== undefined ? '_'+suffix : '')+' option:not(:first-child)').remove();
 	var states = countries[$('select#id_country'+(suffix !== undefined ? '_'+suffix : '')).val()];
-	if(typeof(states) != 'undefined')
+	if(typeof(states) !== 'undefined')
 	{
 		$(states).each(function (key, item){
-			$('select#id_state'+(suffix !== undefined ? '_'+suffix : '')).append('<option value="'+item.id+'"'+ (idSelectedCountry == item.id ? ' selected="selected"' : '') + '>'+item.name+'</option>');
+			$('select#id_state'+(suffix !== undefined ? '_'+suffix : '')).append('<option value="'+item.id+'"'+ (idSelectedCountry === item.id ? ' selected="selected"' : '') + '>'+item.name+'</option>');
 		});
 		
 		$('p.id_state'+(suffix !== undefined ? '_'+suffix : '')+':hidden').slideDown('slow');
@@ -62,7 +62,7 @@ function updateZipCode(suffix)
 {
 	var idCountry = parseInt($('select#id_country'+(suffix !== undefined ? '_'+suffix : '')).val());
 	
-	if (countriesNeedZipCode[idCountry] != 0)
+	if (countriesNeedZipCode[idCountry] !== 0)
 		$('.postcode'+(suffix !== undefined ? '_'+suffix : '')).slideDown('slow');
 	else
 		$('.postcode'+(suffix !== undefined ? '_'+suffix : '')).slideUp('fast');