function getGrade(urlConstant,schoolID)
{
	if(schoolID=="")
	{
		schoolID='null';
	}
	var url  = urlConstant + "&i=" + schoolID;	 
	new Ajax.Updater( 'gradeDivID', url,{
								method: 'get'}
						);
	url = url + "&t=18"; 
	new Ajax.Updater( 'assignDivID', url,{
								method: 'get'}
						);
	return false;
}

function getAssign(url,schoolID,grade)
{
	if(schoolID=="")
	{
		schoolID='null';
	}
	var url  = url + "&i=" + schoolID;
	url = url + "&t=18&grade=" + grade; 
	new Ajax.Updater( 'assignDivID', url,{
								method: 'get'}
						);
	return false;
}


function checkInput()
{
	if(document.getElementById('bySchoolID').value=="")
	{
		alert("Please Select School");
		return false;
	}
	if(document.getElementById('byGradeID').value=="")
	{
		alert("Please Select Grade");
		return false;
	}
	if(document.getElementById('assignSchoolID').value=="")
	{
		alert("Please Select Assign all Student to School");
		return false;
	}
	return true;
}