/*
    Written by Jonathan Snook, http://www.snook.ca/jonathan
    Add-ons by Robert Nyman, http://www.robertnyman.com
*/

function getElementsByClassName(oElm, strTagName, strClassName){
    var arrElements = (strTagName == "*" && oElm.all)? oElm.all : oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    strClassName = strClassName.replace(/\-/g, "\\-");
    var oRegExp = new RegExp("(^|\\s)" + strClassName + "(\\s|$)");
    var oElement;
    for(var i=0; i<arrElements.length; i++){
        oElement = arrElements[i];      
        if(oRegExp.test(oElement.className)){
            arrReturnElements.push(oElement);
        }   
    }
    return (arrReturnElements)
}

function showManureOptions() {
	var manureTrs = getElementsByClassName(document, "tr", "manurerow");
	var length = manureTrs.length;
	for( var item = 0; item < length; item++ ) {
		manureTrs[item].className = "manurerowshow";
	}
	document.forms.available_form.checkmanure.value = 1;
}

function hideManureOptions() {
	var manureTrs = getElementsByClassName(document, "tr", "manurerowshow");
	var length = manureTrs.length;
	for( var item = 0; item < length; item++ ) {
		manureTrs[item].className = "manurerow";
	}
	document.forms.available_form.checkmanure.value = 0;
}