var run=1;  
function main_support() { 
  var ok=1;
  var rc='1px solid #ff0000',orc='1px solid #cccccc',lc='2px solid #ff0000',olc='1px solid #ced0a2';
  var rb='#FFCCCC',orb='#FFFFFF';

  if(undefined===document.forms['main_supp']) {clearInterval(main_support_interval); return;}   
  if(run) {   
    var frm=document.forms['main_supp'];
    
    var email=frm.elements['text_mail'];
    var emailSymbolsRE=/[^a-zA-Z0-9-_@.]/;
      if(emailSymbolsRE.test(email.value)){email.style.backgroundColor=rb;ok=0;}else {email.style.backgroundColor=orb;} 
      var emailRE=/^[-!#$%&'*+\/0-9=?A-Z^_a-z{|}~](\.?[-!#$%&'*+\/0-9=?A-Z^_a-z{|}~])*@[a-zA-Z_](\.?-?[a-zA-Z0-9_])*(\.[a-zA-Z](-?[a-zA-Z0-9])*)+$/;
      if(!emailRE.test(email.value) && !emailSymbolsRE.test(email.value) && email.value) {email.style.border=rc;ok=0;}else {email.style.border=orc;} 
    if(!email.value) {email.style.borderLeft=lc;}

    var tquest=frm.elements['text_question'];
    var tquestRE=/[^a-zA-Z0-9_.,()\-\!\?\n\r\'\`\& ]/;
    if(tquestRE.test(tquest.value)){tquest.style.backgroundColor=rb;ok=0;}else {tquest.style.backgroundColor=orb;}  
    if(!tquest.value) {tquest.style.borderLeft=lc;} else {tquest.style.borderLeft=olc;}

    var tname=frm.elements['text_name'];
    var tnameRE=/[^a-zA-Z]/;
    if(tnameRE.test(tname.value)){tname.style.backgroundColor=rb;ok=0;}else {tname.style.backgroundColor=orb;}  
    if(!tname.value) {tname.style.borderLeft=lc;} else {tname.style.borderLeft=olc;}

    var tsubject=frm.elements['text_subject'];
    var tsubjectRE=/[^a-zA-Z0-9_.,()\-\!\?\n\r\'\`\& ]/;
    if(tsubjectRE.test(tsubject.value)){tsubject.style.backgroundColor=rb;ok=0;}else {tsubject.style.backgroundColor=orb;}  
    if(!tsubject.value) {tsubject.style.borderLeft=lc;} else {tsubject.style.borderLeft=olc;}

    
    var tCompany=frm.elements['text_company'];
    var tCompanyRE=/[^a-zA-Z- ]/;
    if(tCompanyRE.test(tCompany.value)){tCompany.style.backgroundColor=rb;ok=0;}else {tCompany.style.backgroundColor=orb;}  

    var phone=frm.elements['text_phone'];
    var phoneRE=/[^0-9.+ ()]/;
    if(phoneRE.test(phone.value)){phone.style.backgroundColor=rb;ok=0;}else {phone.style.backgroundColor=orb;}  

    if (!email.value || !tquest.value || !tname.value || !tsubject.value) ok=0;
    if(ok==1) frm.bt_send.disabled=false;else frm.bt_send.disabled=true;
  }
}