javascript - Changing the global variable from inside a function, or best practice to achieve the same -

i trying change variable called projectcounter in jquery project don't have repeat buttons inside each div each project. how can make change in 1 function accessible functions? have far:

var projectcounter = 1;  $('a').click(function() {   function setvalue() {     var projectcounter = projectcounter + 1;     alert(window.projectcounter);   } }); 

i have made jsfiddle also: http://jsfiddle.net/cpfrd/

var projectcounter = 1;  $('a').click(function() {   setvalue();//this calls function , makes happen });  //defining/declaring function, doesn't until called  function setvalue() {     projectcounter = projectcounter + 1;//no var keyword because want reference existing variable, not declare new 1     alert(window.projectcounter);   } 

this should address problems why code not working. don't make claims best practice though.