FormValidator Fixer Class for Magento forms in IE7 & IE9. Works with out-of-box Magento JS. Thanks to Tom Rosario for organizing this into a comprehensive object.

form_validator_fixer_class

/* FormValidator Fix for IE7 & IE9 */

var ie7 = $j.browser.msie && $j.browser.version=="7.0";
var ie9 = $j.browser.msie && $j.browser.version=="9.0";
var safari =$j.browser.safari;
/*--------------------------------------------------------------------------*/

var FormValidator = function (form, opts) {
	this.form = $j(form);
	this.required = form.find('.required-entry');
	this.defaults = {
		email: form.find('.validate-email')
	};
	this.options = $j.extend({}, this.defaults, opts);
	this.setup();
};
FormValidator.prototype = {
	setup: function () {
		var self = this;
		
		this.form.submit(function () { 
			self.onSubmit(); 
		});
	},
	validateEmail: function () {
		var emailCheck = this.options.email.val().match(/^([a-z0-9,!\#\$%&'\*\+\/=\?\^_`\{\|\}~-]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z0-9,!\#\$%&'\*\+\/=\?\^_`\{\|\}~-]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*@([a-z0-9-]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z0-9-]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*\.(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]){2,})$/i);
		if (emailCheck != null) { return true; }
		else { return false; }
	},
	onSubmit: function () {
		var self = this, numFilled = 0;
		this.required.each(function (idx) {
			if ($j(this).val().length > 0) {
				numFilled++;
			}
		});
		
		var valid = this.validateEmail() && (numFilled == this.required.length);
		if (valid) {
			this.form.removeAttr('onsubmit');
			this.form.submit();
			return true;
		} else {
		/*uncomment the alert below to test your numFilled variable
		if all is going well it shouldn't incriment and match the 
		number of required inputs you have*/
		//alert(numFilled);
			
		}
	}
};


// [Call function]

 if(ie7 || ie9) { new FormValidator($j('#login-form'));}
   else {$j('#login-form').removeAttr('onsubmit')}

// [HTML]: <form action="[magento action]" onsubmit="return false">