Javascript function for ProperCase

I have just written the JavaScript function for Propercase.
You can use this function directly by replacing the str value.

var getResult = ProperCase("i am tEstinG tHe propeR cAse funcTion");

function ProperCase(str)
{
var arrstr=new Array();
arrstr=str.split(" ");
var temp_1;
var temp_2;
var result="";
for(var i=0; i<arrstr.length; i++)
{
 temp_1=arrstr[i].substr(0,1);
 temp_1=temp_1.toUpperCase();
 temp_2 = arrstr[i].slice(1);
 temp_2 = temp_2.toLowerCase();
 result = result+" "+temp_1.concat(temp_2)
}
return result;
}

I hope this will be helpful.