function Location() {
    var i, j, a, b, p
    this.parameters = new Array()
    if((j=document.location.href.lastIndexOf('?'))==-1)
        this.path = document.location.href
    else {
        this.path = document.location.href.substring(0, j)
        a = document.location.href.substr(j+1).split('&')
        for (p in a) {
            b = a[p].split('=')
            this.parameters[b[0]] = b[1]
        }
    }

    this.querystring = function() {
        var p, s = ''
        for (p in this.parameters)
            if(this.parameters[p]!=null)
                s+= (s==''?'?':'&') + p + '=' + this.parameters[p].toString(10).split('#')[0]
        return s
    }

    this.location = function(page_name) {
        return (page_name==null || page_name==''?this.path:page_name) + this.querystring()
    }
    
    this.clear_parameters = function() {
        var i
        for(i=0;i<arguments.length;i++)
            if(this.parameters[arguments[i]]!=null)
                this.parameters[arguments[i]]=null
    }
}
var page = new Location()