function addSortOnClick(thId, sortById, sortDirId, sortValue, sortButtonId){
	thId.onclick = function(){toggleSort(sortById, sortDirId, sortValue, sortButtonId);};
	thId.onmouseover = function(){this.style.textDecoration="underline";};
	thId.onmouseout = function(){this.style.textDecoration="none";};
}

function toggleSort(sortById, sortDirId, sortValue, sortButtonId){
	
	if(sortValue == document.getElementById(sortById).value)
		toggleSortDir(sortDirId);
	else
		document.getElementById(sortDirId).value = "ASC";
	
	document.getElementById(sortById).value = sortValue;
	document.getElementById(sortButtonId).click();
}

function toggleSortDir(sortDirId){
	var searchDirection = document.getElementById(sortDirId).value;
	
	if(searchDirection == "ASC")
		document.getElementById(sortDirId).value = "DESC";
	else
		document.getElementById(sortDirId).value = "ASC";
}