function check_partner_form() {

	var mandatory = "";
	var nameFilter = /^[a-zA-Z\xc0-\xff\-\.\']{2,}|[a-zA-Z\xc0-\xff\-\.\']{2,}[\s][a-zA-Z\xc0-\xff\-\.\']{2,}$/;
	var emailFilter = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;
	var urlFilter = /^(([\w]+:)?\/\/)?(([\d\w]|%[a-fA-f\d]{2,2})+(:([\d\w]|%[a-fA-f\d]{2,2})+)?@)?([\d\w][-\d\w]{0,253}[\d\w]\.)+[\w]{2,4}(:[\d]+)?(\/([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)*(\?(&?([-+_~.\d\w]|%[a-fA-f\d]{2,2})=?)*)?(#([-+_~.\d\w]|%[a-fA-f\d]{2,2})*)?$/;
	var phoneFilter = /^\+?[\d\s]+\(?[\d\s]{10,}$/;
	
	
/*
	if ((!document.getElementById('phone').value) || !(phoneFilter.test(document.getElementById('phone').value))) {
		mandatory = mandatory + " " + document.getElementById('phone_label').innerHTML.replace(':', '') + "\n";
		document.getElementById('phone').style.backgroundColor = '#bec8da';
		document.getElementById('phone_label').style.color = '#ffd964'; 
		document.getElementById('phone_label').innerHTML = 'Type valid phone number';
		document.getElementById('phone').focus(); 
	} 
	else {
		document.getElementById('phone').style.backgroundColor = '#fff';
		document.getElementById('phone_label').innerHTML = 'Telephone';
	}
*/
	
	if (!(document.getElementById('URL').value) || !(urlFilter.test(document.getElementById('URL').value))) { 
		mandatory = mandatory + " " + document.getElementById('URL_label').innerHTML.replace(':', '') + "\n"; 
		document.getElementById('URL').style.backgroundColor = '#bec8da'; 
		document.getElementById('URL_label').style.color = '#ffd964'; 
		document.getElementById('URL_label').innerHTML = 'Type valid website address';
		document.getElementById('URL').focus();
	} 
	else { 
		document.getElementById('URL').style.backgroundColor = '#fff'; 
		document.getElementById('URL_label').style.color = '#eee'; 
		document.getElementById('URL_label').innerHTML = 'Website';
	}

	if (!(document.getElementById('email').value) || !(emailFilter.test(document.getElementById('email').value))) { 
		mandatory = mandatory + " " + document.getElementById('email_label').innerHTML.replace(':', '') + "\n";
		document.getElementById('email').style.backgroundColor = '#bec8da'; 
		document.getElementById('email_label').style.color = '#ffd964'; 
		document.getElementById('email_label').innerHTML = 'Type valid Email address';
		document.getElementById('email').focus();
	} 
	else { 
		document.getElementById('email').style.backgroundColor = '#fff'; 
		document.getElementById('email_label').style.color = '#eee'; 
		document.getElementById('email_label').innerHTML = 'Email';
	}

	if (!(document.getElementById('last_name').value) || !(nameFilter.test(document.getElementById('last_name').value))) { 
		mandatory = mandatory + " " + document.getElementById('last_name_label').innerHTML.replace(':', '') + "\n";
		document.getElementById('last_name').style.backgroundColor = '#bec8da'; 
		document.getElementById('last_name_label').style.color = '#ffd964'; 
		document.getElementById('last_name_label').innerHTML = 'Type valid name';
		document.getElementById('last_name').focus();
	} 
	else {
		document.getElementById('last_name').style.backgroundColor = '#fff';
		document.getElementById('last_name_label').style.color = '#eee'; 
		document.getElementById('last_name_label').innerHTML = 'Name';
	}

	if (!mandatory) { // good to submit
		// prepare retURL - the url which salesforce opens after processing the submit - with user data
	    document.getElementById('retURL').value = document.getElementById('retURL').value + 
	    "&txtEmail=" + document.getElementById('email').value + 
	    "&txtConfEmail=" + document.getElementById('email').value +
	    "&txtPhone=" + document.getElementById('phone').value;

	    return true;
	}

    return false; // abort submit
}