function checkform()
{
	if ((document.forms.mf.txtName.value == "") || 
			(isblank(document.forms.mf.txtName.value))) {
		alert ("Please fill in your name.");
		document.forms.mf.txtName.focus();
		return false;
	}
	
	if ((document.forms.mf.txtZip.value == "") || 
			(isblank(document.forms.mf.txtZip.value))) {
		alert ("Please fill in your zip code.");
		document.forms.mf.txtZip.focus();
		return false;
	}
	
	if(IsUSzipCode(document.forms.mf.txtZip.value) == false) {
		alert("Your zip code is not formatted correctly.  Please take another look.");
		document.forms.mf.txtZip.focus();
		return false;
	}
	if (isemail(document.forms.mf.txtEmail.value) == false){
		alert ("Your email address is not the correct format, please take another look.");
		document.forms.mf.txtEmail.focus();
		return false;
	}
	
	if ((document.forms.mf.txtPhone.value == "") || 
			(isblank(document.forms.mf.txtPhone.value))) {
		alert ("Please fill in your phone number.");
		document.forms.mf.txtPhone.focus();
		return false;
	}
	
	if(IsUSphoneNumber(document.forms.mf.txtPhone.value) == false) {
		alert("Your phone number is not formatted correctly.  Please include the area code so it looks like (777) 777-7777.");
		document.forms.mf.txtPhone.focus();
		return false;
	}
} // END function checkform()