function delCSSRule(selector) {
	var theRules = new Array();
	for (var i=0;i<document.styleSheets.length;i++) {
		if (document.styleSheets[i].cssRules) {
			theRules = document.styleSheets[i].cssRules;
		}
		else {
			theRules = document.styleSheets[i].rules;
		}
		for (var j=theRules.length-1;j>=0;j--) {
			if (theRules[j].selectorText == selector) {
				document.styleSheets[i].deleteRule(j);
				return;
			}
		}
	}
}

delCSSRule('.blue_ban_block1 a:hover');
delCSSRule('.blue_ban_block2 a:hover');
delCSSRule('.blue_ban_block3 a:hover');
delCSSRule('.blue_ban_block4 a:hover');

$(function () { 
	
  $('.blue_ban_block1 a')
    .append('<span class="hover1" />').each(function () {
      var $span = $('> span.hover1', this).css('opacity', 0);
      $(this).hover(function () {
        $span.stop().fadeTo(500, 1);
      }, function () {
        $span.stop().fadeTo(500, 0);
      });
    });
    
  $('.blue_ban_block2 a')
    .append('<span class="hover2" />').each(function () {
      var $span = $('> span.hover2', this).css('opacity', 0);
      $(this).hover(function () {
        $span.stop().fadeTo(500, 1);
      }, function () {
        $span.stop().fadeTo(500, 0);
      });
    });

  $('.blue_ban_block3 a')
    .append('<span class="hover3" />').each(function () {
      var $span = $('> span.hover3', this).css('opacity', 0);
      $(this).hover(function () {
        $span.stop().fadeTo(500, 1);
      }, function () {
        $span.stop().fadeTo(500, 0);
      });
    });

  $('.blue_ban_block4 a')
    .append('<span class="hover4" />').each(function () {
      var $span = $('> span.hover4', this).css('opacity', 0);
      $(this).hover(function () {
        $span.stop().fadeTo(500, 1);
      }, function () {
        $span.stop().fadeTo(500, 0);
      });
    });    
    
});