function hideall(){
document.getElementById("aboutus").style.display = "none";
document.getElementById("rates").style.display = "none";
document.getElementById("clients").style.display = "none";
document.getElementById("contact").style.display = "none";
document.getElementById("quotes").style.display = "none";
}
function hideme(id) {
document.getElementById(id).style.display = "none";
}
function showme(id) {
 hideall();
 document.getElementById(id).style.display = "block";
 }


 
function changeme(id, action) {
if (action=="hide") {
            document.getElementById(id).style.display = "none";
       } else {
            document.getElementById(id).style.display = "block";
       }
}


//Fadein experiment


function opacity(id, opacStart, opacEnd, millisec) {
    //speed for each frame
    var speed = Math.round(millisec / 100);
    var timer = 0;

    //determine the direction for the blending, if start and end are the same nothing happens
    if(opacStart > opacEnd) {
        for(i = opacStart; i >= opacEnd; i--) {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    } else if(opacStart < opacEnd) {
        for(i = opacStart; i <= opacEnd; i++)
            {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    }
}

//change the opacity for different browsers
function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
} 


function shiftOpacity(id, millisec) {
    //if an element is invisible, make it visible, else make it ivisible
    if(document.getElementById(id).style.opacity == 0) {
        opacity(id, 0, 100, millisec);
    } else {
        opacity(id, 100, 0, millisec);
    }
}