function $(elem_id)
{
	return document.getElementById(elem_id);
}

function disableElement(elem_id)
{

	elem_id.disabled = true;
}

function enableElement(elem_id)
{
	elem_id.disabled = false;
}

function toggleDisableElement(elem_id)
{
	if(elem_id.disabled == true)
		elem_id.disabled = false;
	else
		elem_id.disabled = true;
}

function toggleDisableElements(){
	elemArray = toggleDisableElements.arguments;
	arrLen = elemArray.length;
	for (var i = 0; i < arrLen; i++){
		elem_id = $(elemArray[i]);
		if (elem_id){
	        if(elem_id.disabled == true)
				elem_id.disabled = false;
			else
				elem_id.disabled = true;
		}
	}
}