Webber opened the scoring with a superb strike on 26 minutes
Sheffield United overcame struggling Championship rivals Charlton to reach the fifth round of the FA Cup.
Danny Webber opened the scoring with a stunning strike when he drilled a vicious 30-yard shot from the left wing into the top-right corner.
United doubled their lead after the break when substitute Lee Hendrie scored with a deflected free-kick.
Charlton pulled a goal back when Chris Dickson lobbed into the bottom left corner but an equaliser proved elusive.
It was the Addicks who had the first opportunities, Deon Burton heading over after goalkeeper Ian Bennett had fumbled Lloyd Sam's cross.
Darren Ambrose then powered into the area only to have his effort smothered by Bennett.
The Blades had the bulk of possession, however, and Billy Sharp's hopeful cross skidded across the six-yard box and bounced up for Webber, whose improvised header did not trouble goalkeeper Rob Elliott.
But a minute later Webber atoned in style when his ferocious effort sailed in.
He could have added a second shortly before half-time but snatched at his shot when Sharp's deflected cross fell into his path six yards out.
But Hendrie increased the advantage when a 25-yard effort took an unfortunate deflection off the Charlton wall to wrong-foot Elliott.
Charlton found themselves back in the match when a lack of communication in the home defence resulted in Matthew Kilgallon misjudging a straightforward long ball from Jonathan Fortune and Dickson nipped in to chip the stranded Bennett.
The visitors pressed for a late equaliser, but Dickson's acrobatic overhead kick skewed wide and it was the Blades who went through.
Sheffield United manager Kevin Blackwell:
"That's nine now unbeaten and five victories on the trot and we're learning to win games.
"We've always said 'sometimes you can win with style but others it's going to be tough and uncompromising' and today was all about the latter.
"I made five changes and we still went on to win which speaks volumes for the winning mentality of the club."
Charlton manager Phil Parkinson:
"I believe the least we deserved was to take Sheffield back to The Valley.
"At 2-0 down I thought we came back terrifically well and I thought we should have had a penalty at the death.
"I'm not sure if the referees have got together and said Charlton are not allowed penalties and I'm just waiting for one to put his whistle in his mouth and give us one."
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