diff --git a/lib/WebGUI/Form/Float.pm b/lib/WebGUI/Form/Float.pm
index 700574ebf..7b4f4b814 100644
--- a/lib/WebGUI/Form/Float.pm
+++ b/lib/WebGUI/Form/Float.pm
@@ -117,7 +117,7 @@ Renders a floating point field.
 sub toHtml {
         my $self = shift;
 	$self->session->style->setScript($self->session->url->extras('inputCheck.js'),{ type=>'text/javascript' });
-	$self->set("extras", $self->get('extras') . ' onkeyup="doInputCheck(this.form.'.$self->get("name").',\'0123456789-.\')"');
+	$self->set("extras", $self->get('extras') . ' onkeyup="doInputCheck(document.getElementById(\''.$self->get("id").'\'),\'0123456789-.\')"');
 	return $self->SUPER::toHtml;
 }
 
diff --git a/lib/WebGUI/Form/Integer.pm b/lib/WebGUI/Form/Integer.pm
index 311a583fa..e476aa68a 100644
--- a/lib/WebGUI/Form/Integer.pm
+++ b/lib/WebGUI/Form/Integer.pm
@@ -117,7 +117,7 @@ Renders an integer field.
 sub toHtml {
         my $self = shift;
 	$self->session->style->setScript($self->session->url->extras('inputCheck.js'),{ type=>'text/javascript' });
-	$self->set("extras", $self->get('extras') . ' onkeyup="doInputCheck(this.form.'.$self->get("name").',\'0123456789-\')"');
+	$self->set("extras", $self->get('extras') . ' onkeyup="doInputCheck(document.getElementById(\''.$self->get("id").'\'),\'0123456789-\')"');
 	return $self->SUPER::toHtml;
 }
 
diff --git a/lib/WebGUI/Form/Phone.pm b/lib/WebGUI/Form/Phone.pm
index 7444254e9..ed46ed495 100644
--- a/lib/WebGUI/Form/Phone.pm
+++ b/lib/WebGUI/Form/Phone.pm
@@ -96,7 +96,7 @@ Renders a phone number field.
 sub toHtml {
         my $self = shift;
 	$self->session->style->setScript($self->session->url->extras('inputCheck.js'),{ type=>'text/javascript' });
-        $self->set("extras", $self->get('extras') . ' onkeyup="doInputCheck(this.form.'.$self->get("name").',\'x0123456789-()+ \')" ');
+        $self->set("extras", $self->get('extras') . ' onkeyup="doInputCheck(document.getElementById(\''.$self->get("id").'\'),\'x0123456789-()+ \')" ');
 	return $self->SUPER::toHtml;
 }
 
diff --git a/lib/WebGUI/Form/TimeField.pm b/lib/WebGUI/Form/TimeField.pm
index c7b82cc77..a59812e5b 100644
--- a/lib/WebGUI/Form/TimeField.pm
+++ b/lib/WebGUI/Form/TimeField.pm
@@ -110,7 +110,7 @@ sub toHtml {
 	my $value = $self->session->datetime->secondsToTime($self->get("value"));
 	my $i18n = WebGUI::International->new($self->session);
 	$self->session->style->setScript($self->session->url->extras('inputCheck.js'),{ type=>'text/javascript' });
-	$self->set("extras", $self->get('extras') . ' onkeyup="doInputCheck(this.form.'.$self->get("name").',\'0123456789:\')"');
+	$self->set("extras", $self->get('extras') . ' onkeyup="doInputCheck(document.getElementById(\''.$self->get("id").'\'),\'0123456789:\')"');
 	return $self->SUPER::toHtml
 		.WebGUI::Form::Button->new($self->session,
 			id=>$self->get('id'),
diff --git a/lib/WebGUI/Form/Zipcode.pm b/lib/WebGUI/Form/Zipcode.pm
index e9e6994fc..a78b983cc 100644
--- a/lib/WebGUI/Form/Zipcode.pm
+++ b/lib/WebGUI/Form/Zipcode.pm
@@ -104,7 +104,7 @@ Renders a zip code field.
 sub toHtml {
         my $self = shift;
 	$self->session->style->setScript($self->session->url->extras('inputCheck.js'),{ type=>'text/javascript' });
-	$self->set("extras", $self->get('extras') . ' onkeyup="doInputCheck(this.form.'.$self->get("name").',\'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ- \')"');
+	$self->set("extras", $self->get('extras') . ' onkeyup="doInputCheck(document.getElementById(\''.$self->get("id").'\'),\'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ- \')"');
 	return $self->SUPER::toHtml;
 }