Java

import java.util.Stack;
public class infixToPostfix{
    private int index;
    private char ch;
    private char lparenthesis='(';
    private char rparenthesis=')';
    Stack stack=new Stack();
    private String output="";
    public boolean isOperator(char op){
        if(op == '^' || op == '*' ||op == '/' || op == '%' || op == '+' || op == '-')return true;
        else return false;
    }
    public boolean isOperand(char opr){
        if(opr >= 'A' && opr <='Z')return true;
        else if(opr >= 'a' && opr <= 'z')return true;
        else return false;
    }
    public int getPrecedence(char c){
        switch(c){
            case '(': case ')': return 5;
            case '^':return 4;
            case '*': case '/': case '%': return 3;
            case '+': case '-': return 2;
        }return 0;
    }
    public String getPostfix(String expr){      
        stack.push('(');
        for(index=0;index<expr.length();index++){
            ch=expr.charAt(index);                      
            if(isOperand(ch)){
                output=output+ch;
            }
            else if(ch == lparenthesis){
                stack.push(lparenthesis);
            }
            else if(isOperator(ch)){
               Object pop=stack.pop();
               char ch1=pop.toString().charAt(0);
               while(getPrecedence(ch1) >= getPrecedence(ch) ){
                   if(!stack.empty())stack.pop();
                   else break;
                   if(isOperator(ch1)){
                       output=output+ch1;
                   }
               }stack.push(ch);
            }
            else if(ch == rparenthesis){
                while(stack.pop().toString().charAt(0) != lparenthesis){
                    if(isOperator(stack.pop().toString().charAt(0)))
                    output=output+stack.pop();
                }                
            }
            else {
               System.out.print("error.");
            }
        }
        stack.clear();
        return output;
    }
}

<ul>
    <li id="menuHome"><a href="index.html" onMouseOver="setMenu('menuHome')" >Home</a></li>
    <li id="menuResults"><a href="results.htm">Results</a></li>
    <li id="menuEvents"><a href="events.htm">Events</a></li>
</ul>

#menuHome {
	background-color: #CCC;
	color: #000;
}


#navleft ul {
	list-style: none;
	padding: 0;
	margin: 0 0 5px 0 ;
	text-align: left;
}

#navleft li {
	margin: 5px 0;
	line-height: 23px;
}

#navleft li a {
	text-decoration: none;
	padding-left: 9px;
    display: block;
	width: 140px;
}

function setMenu( id )
{
    var e = document.getElementById(id);
    e.style.backgroundColor = 0x666666;
    e.style.color = 0xFFFFFF;

}