//Isset function
function isset(varname){
  return(typeof(window[varname])!='undefined');
}

//Function to change the class of number buttons
function changeClass(image_number) {
	document.getElementById("button_"+image_number).className = "active";
	document.getElementById("button_"+image_number).blur();
	
	if(undefined===window.previous_image){
	window.previous_image = image_number;
	} else {
	document.getElementById("button_"+previous_image).className = "not_active";
	window.previous_image = image_number;
	}
}

function changeImage(i) {
	//Fade new background image into 'main'
	blendimage('main','blendimage', src_array[i-1],800)

	//Call the function to generate the navigation panel
    changeClass(i);
}

var browser=navigator.appName;
if (browser=="Microsoft Internet Explorer"){
	window.onpageshow =  changeImage(1); preloader(); hideLoadBox();
	window.onload = hideLoadBox;
} else {
	window.onpageshow =  preloader(); hideLoadBox();
	window.onload = changeImage(1); hideLoadBox();
}