function validate_form(strForm) {
    var error = false;
    var errEmail = "";
    reset('lblName');reset('lblCompany');reset('lblEmail');reset('lblPhone');reset('lblComments');

    //ENFORCE MAX LENGTH FOR TEXT AREA
    if (isValidLength(strForm.comments) == false) 
       error = true;


    //CHECK FOR VALID EMAIL
    if (isValidEmail(strForm.email) == false)
       error = true;


    //CHECK THEIR PREFERRED METHOD OF CONTACT
    if (strForm.rdoPref[0].checked) {		//SELECTED EMAIL CONTACT
        if (isBlank(strForm.email,'lblEmail') == true) 
           error = true;
    }
     else if (strForm.rdoPref[1].checked) {	//SELECTED Phone CONTACT
        if (isBlank(strForm.phone,'lblPhone') == true) 
           error = true;
    }
     else { 					//NO RADIO BUTTON SELECTED
        if(isBlank(strForm.email,'lblEmail')==false && isBlank(strForm.phone, 'lblPhone')==true) {
           //EMAIL IS THE ONLY FILLED-OUT FIELD.  AUTO-SELECT EMAIL BUTTON
           strForm.rdoPref[0].checked = true;
           reset('lblPhone');
        }
         else if(isBlank(strForm.phone,'lblPhone')==false && isBlank(strForm.email, 'lblEmail')==true) {
            //PHONE IS THE ONLY FILLED-OUT FIELD.  AUTO-SELECT PHONE BUTTON
            strForm.rdoPref[1].checked = true;
            reset('lblEmail');
        }
         else if (isBlank(strForm.phone,'lblPhone')==true && isBlank(strForm.email, 'lblEmail')==true) 
           { error = true; }
    }

    //CHECK FOR BLANK COMPANY
    if (isBlank(strForm.company, 'lblCompany') == true)
       error = true;
    

    //CHECK FOR BLANK NAME
    if (isBlank(strForm.name,'lblName') == true)
       error = true;
        

    if (error == true)
       return false;
  }




  function isBlank(field,label) {
    if (field.value==null || field.value=="") {
       document.getElementById(label).style.color = "red";
       field.focus();
       return true;
    }
    else {
       document.getElementById(label).style.color = "#999";
       return false;
    }
  }


  function reset(label) {
    document.getElementById(label).style.color = "#999";
  }


  function isValidEmail(field) {
    var apos = field.value.indexOf("@");
    var dotpos = field.value.lastIndexOf(".");

    //CHECK ONLY IF EMAIL FIELD IS NOT BLANK
    if (field.value.length > 1) {

      if (apos<1 || dotpos-apos<2) {
         document.getElementById('lblEmail').style.color = "red";
         document.getElementById('emailError').style.visibility = "visible";
         field.focus();
         return false;
      }
      else {
         document.getElementById('lblEmail').style.color = "#999";
         document.getElementById('emailError').style.visibility = "hidden";
         return true;
      }
    }
    else { 
         document.getElementById('lblEmail').style.color = "#999";
         document.getElementById('emailError').style.visibility = "hidden";
         return true;
    }
  }


  function isValidLength(field) {

    if (field.value.length > 5000) {
       document.getElementById('lblComments').style.color = "red";
       document.getElementById('commentsError').style.visibility = "visible";
       field.focus();
       return false;
    }
    else {
       document.getElementById('lblComments').style.color = "#999";
       document.getElementById('commentsError').style.visibility = "hidden";
       return true;
    }
  }