// JavaScript Document

function checkEmail(email) {
	var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	if (!filter.test(email)) {
		return false;
	}
	else {
		return true;
	}
}
function isEmail(str) {
	  // are regular expressions supported?
	  var supported = 0;
	  if (window.RegExp) {
		var tempStr = "a";
		var tempReg = new RegExp(tempStr);
		if (tempReg.test(tempStr)) supported = 1;
	  }
	  if (!supported) 
		return (str.indexOf(".") > 2) && (str.indexOf("@") > 0);
	  var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
	  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{1,5}|[0-9]{1,5})(\\]?)$");
	  return (!r1.test(str) && r2.test(str));
	}

	
function clearText(field){
			if (field.defaultValue == field.value) field.value = '';
			else if (field.value == '') field.value = field.defaultValue;
		}
		
	
function checkSearch() {
	if(document.getElementById('keyword').value == "") {
		alert('Please enter a search query');
		return false;
	}
	return true;
}