function addLoadEvent(func) {
	  var oldonload = window.onload;
	  if (typeof window.onload != 'function') {
	    window.onload = func;
	  } else {
	    window.onload = function() {
	      oldonload();
	      func();
	    }
	  }
	}
		function validateForm(whichform) {
		  for (var i=0; i<whichform.elements.length; i++) {
		    var element = whichform.elements[i];
		    if (element.className.indexOf("required") != -1) {
		      if (!isFilled(element)) {
		        alert("Please fill in the "+element.name+" box!");
		        return false;
		      }
		    }
		    if (element.className.indexOf("email") != -1) {
		      if (!isEmail(element)) {
		        alert("The "+element.name+" field must be a valid email address.");
		        return false;
		      }
		    }
		  }
		  return true;
		}

		function isFilled(field) {
		  if (field.value.length < 1 || field.value == field.defaultValue) {
		    return false;
		  } else {
		    return true;
		  }
		}

		function isEmail(field) {
		  if (field.value.indexOf("@") == -1 || field.value.indexOf(".") == -1) {
		    return false;
		  } else {
		    return true;
		  }
		}

		function prepareForms() {
		  for (var i=0; i<document.forms.length; i++) {
		    var thisform = document.forms[i];
		    resetFields(thisform);
		    thisform.onsubmit = function() {
		      return validateForm(this);
		    }
		  }
		}
	
		function resetFields(whichform) {
		  for (var i=0; i<whichform.elements.length; i++) {
		    var 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;
		      }
		    }
		  }
		}
		
	   addLoadEvent(prepareForms);