function showRows(rowClass,jsChange){
	arrElements = getElementsByClassName ( 'tr', rowClass)
	for(i=0;i<arrElements.length;i++){
		arrElements[i].style.display = 'table-row';
	}
	document.getElementById(jsChange).innerHTML = '<a href="javascript:;" onclick="hideRows(\'' + rowClass + '\',\'' + jsChange + '\')">Course Details <</a>';
}

function hideRows(rowClass,jsChange){
	arrElements = getElementsByClassName ( 'tr', rowClass)
	for(i=0;i<arrElements.length;i++){
		arrElements[i].style.display = 'none';
	}
	document.getElementById(jsChange).innerHTML = '<a href="javascript:;" onclick="showRows(\'' + rowClass + '\',\'' + jsChange + '\')">Course Details ></a>';
}

function getElementsByClassName(stringElementType, stringClassName) {
	d = document.getElementsByTagName(stringElementType);
	j=0;
	var cl = new Array()
	for(i=0;i<d.length;i++){
		if(d[i].className == stringClassName){
			cl[j] = d[i];
			j++
		}
	}
	return cl
}

//LOADING DIV AND REPLACING INNERHTML
function checkEmail(input,divChange){
	var ajaxRequest;  // The variable that makes Ajax possible!
	
	try{
		// Opera 8.0+, Firefox, Safari
		ajaxRequest = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try{
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				// Something went wrong
				alert("Your browser broke!");
				return false;
			}
		}
	}
	// Create a function that will receive data sent from the server
	ajaxRequest.onreadystatechange = function(){
		if(ajaxRequest.readyState == 4){
			var ajaxDisplay = document.getElementById(divChange);
			ajaxDisplay.innerHTML = ajaxRequest.responseText;
		}
	}
	var queryString = "?input=" + document.getElementById(input).value;
	ajaxRequest.open("GET", "ajax.php" + queryString, true);
	ajaxRequest.send(null);
}

function subForm(form,field){
	if(document.getElementById(field).value == '') {
		return false;
	} else {
	 	return true;
	}
}