var serverURL = "http://www.vintagetshirtstore.com/";

function isNumeric(co) {
  if (co == null){return false;}
  if (co == NaN){return false;}
  var RegExp = /^(-)?(\d*)(\.?)(\d*)$/;
  var res = co.toString().match(RegExp);
  return res;
}

function validEmail(m){
  var ret = true;
  if (m == ""){return false;}
  var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
  if (!filter.test(m)){ret = false;}
  return ret;
}

function trim(str){
  if (!str){return "";}
  if (str == ""){return "";}
  return str.replace(/^\s+|\s+$/g,"");
}

function clearDesc(){
  var el = document.getElementById("imgdesc");
  if (el){el.innerHTML = " ";}
  el = document.getElementById("overlayimage");
  if (el){el.style.visibility = "hidden";}
}

function getAjax(){
  if (window.XMLHttpRequest){return new XMLHttpRequest();}else if(window.ActiveXObject){return new ActiveXObject("Microsoft.XMLHTTP");}
  return null;
}

function showTermsWindow(){
 var url = serverURL + "jscript/terms.php";
 var width = 550;
 var height = 600;
 newWin = window.open(url,'termsWindow','left='+((screen.width-width)/2.1)+',top='+((screen.height-height)/2)+',menubar=0,scrollbars=0,status=0,location=0,resizable=0,width='+ width.toString() +',height=' + height.toString());
 newWin.focus();
}

function showModalWindow(ako){
  var el = document.getElementById('modalwin');
  if (!el){return;}
  if (ako==1){el.style.visibility = 'visible';}else{el.style.visibility = 'hidden';}
}