Window History Back (-1) Not Working

I have use below code to back for the previous page, but it's not working. the alert box still popup even i click ok on the page. actually there have 3 page include this windows p

Solution 1:

Use: window.history.back() instead .go();

http://www.w3schools.com/jsref/met_his_back.asp

or use:

window.alert("Please choose Type of Redemption");
setTimeout(function(){
  window.history.go(-1);
},500);

Solution 2:

I would always avoid using alert(), since it kills script in some Browsers. I would open() a new window and ButtonElement.onclick use location =.

Note:

window is implicit, so you don't need to write window.open() or window.location. Additionally, it's fine to leave off .href when referring to location.href