function site_url(str)
{
	return SITEURL+str;
}

function $(obj) {
	return document.getElementById(obj);
}

String.prototype.trim = function(  ) {
	return (this.replace(/^[\s\xA0]+/, "").replace(/[\s\xA0]+$/, ""));
}

function isEmpty(field)
{
	var sText = document.getElementById(field).value.trim();
	return (sText == "" || sText == null || sText.charAt(0) == ' ');
}

function isEmail(field)
{
	var x = document.getElementById(field).value.trim();
	var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
	return filter.test(x);
}