function checkEmail () {
	var form 	= document.getElementById('email_alerts');
	var input	= document.getElementById('email');
	var para	= form.getElementsByTagName('p');
	
	var input_val = input.value;
	
	if(input_val.match(/^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9\.]{2,4})+$/)) {
		return true;
	} else {
		for(x in para) {
			if(para[x].className == "error") {				
				para[x].style.display = "block";				
			}
		}
		return false;
	}
}