function getElementsByClassName(classname, node)  {
    if(!node) node = document.getElementsByTagName("body")[0];
    var a = [];
    var re = new RegExp('\\b' + classname + '\\b');
    var els = node.getElementsByTagName("*");
    for(var i=0,j=els.length; i<j; i++)
        if(re.test(els[i].className))a.push(els[i]);
    return a;
}

function ckform(){
	var reqs = getElementsByClassName('required');
	var flag = false;
	for (var i=0; i<reqs.length; i++){
		if (reqs[i].value == ""){
			flag = true;
		}
	}
	
	if (flag == true){
		alert("Please fill in all required fields and try again.");
		return false;
	} else {
		flag = false;
	}
}