function addLoadEvent(func) {
  var oldonload=window.onload;
  if (typeof window.onload != "function") {
    window.onload=func;
  } else {
    window.onload=function() {
      oldonload();
      func();
    }
  }
};
function makeSmartField(whichForm) {
  var len=whichForm.elements.length;
  var element;
  for (var i=0; i<len; i++) {
    element=whichForm.elements[i];
    if (element.type=="submit") continue;
    if (!element.defaultValue) continue;
    element.onfocus=function() {
      if (this.value==this.defaultValue) {
        this.value="";
      }
    }
    element.onblur=function() {
      if (this.value=="") {
        this.value=this.defaultValue;
      }
    }
  }
};
function prepForms() {
  var len=document.forms.length;
  for (var i=0; i<len; i++) {
    makeSmartField(document.forms[i]);
  }
};
addLoadEvent(prepForms);