//全选中所有勾选项
function selectAllItem(item_name) {
	var items = document.getElementsByName(item_name);
	for(var i = 0; i < items.length; i++) {
		items[i].checked = event.srcElement.checked;
	}
}



//取出被选上的选项
function selected(item_name){    
    var selectedItem = new Array();
    var items = document.getElementsByName(item_name);
    var index = 0;
    for(var i = 0; i < items.length; i++) {
		if(items[i].checked) {
			selectedItem[index]=items[i];			
			index++;
		}
	}
	return selectedItem;
 }
 
 function GetE( elementId )
{
	return document.getElementById( elementId )  ;
}

function ShowE( element, isVisible )
{
	if ( typeof( element ) == 'string' )
		element = GetE( element ) ;
	element.style.display = isVisible ? '' : 'none' ;
}