function BlockEnter(evt){
	evt = (evt) ? evt : event; 
	var charCode=(evt.charCode) ? evt.charCode : 
		((evt.which) ? evt.which : evt.keyCode);
	if ( Number(charCode) == 13 || Number(charCode) == 3) {
		return false;
	} else {
		return true;
	}
}
		
function attachBlockEnter(formid) {
	var elements = document.forms[formid].elements;
	for (var j=0; j < elements.length; j++) {
		var e = elements[j];	
		if (e.type == "text"){
			e.onkeypress=BlockEnter;
		}
		else if (e.type == "textarea"){
			e.onkeypress=BlockEnter;
		}
		else if (e.type == "checkbox"){
			e.onkeypress=BlockEnter;
		}
	}
}