function selectAllFormItemsOfType(typeName_str, formname_str){

	var form_array = document.forms[formname_str].elements;


	var i = 0;

	
	for(i = 0; i <   form_array.length ; i++){
		
		var formElement = form_array[i];
		if(formElement.type == "checkbox"){
			
			formElement.checked = true;

		};
	};

};