var divLoading = null;


function getPageScroll(){

    var yScroll;

    if (self.pageYOffset) {
        yScroll = self.pageYOffset;
    } else if (document.documentElement && document.documentElement.scrollTop){  // Explorer 6 Strict
        yScroll = document.documentElement.scrollTop;
    } else if (document.body) {// all other Explorers
        yScroll = document.body.scrollTop;
    }

    arrayPageScroll = new Array('',yScroll) 
    return arrayPageScroll;
}

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){
    
    var xScroll, yScroll;
    
    if (window.innerHeight && window.scrollMaxY) {  
        xScroll = document.body.scrollWidth;
        yScroll = window.innerHeight + window.scrollMaxY;
    } else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
        xScroll = document.body.scrollWidth;
        yScroll = document.body.scrollHeight;
    } else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
        xScroll = document.body.offsetWidth;
        yScroll = document.body.offsetHeight;
    }
    
    var windowWidth, windowHeight;
    if (self.innerHeight) { // all except Explorer
        windowWidth = self.innerWidth;
        windowHeight = self.innerHeight;
    } else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
        windowWidth = document.documentElement.clientWidth;
        windowHeight = document.documentElement.clientHeight;
    } else if (document.body) { // other Explorers
        windowWidth = document.body.clientWidth;
        windowHeight = document.body.clientHeight;
    }   
    
    // for small pages with total height less then height of the viewport
    if(yScroll < windowHeight){
        pageHeight = windowHeight;
    } else { 
        pageHeight = yScroll;
    }

    // for small pages with total width less then width of the viewport
    if(xScroll < windowWidth){  
        pageWidth = windowWidth;
    } else {
        pageWidth = xScroll;
    }


    arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
    return arrayPageSize;
}



function showLoadingDiv(text, showLoadingImage)
{
	divLoading = document.createElement('div');
	divLoading.setAttribute('id','divLoading');
  
    var height = 10;
    var width = 220;
	
	var arrayPageSize = getPageSize();
    var arrayPageScroll = getPageScroll();

    var y = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - height) / 2);
    var x = ((arrayPageSize[0] - 20 - width) / 2);
    divLoading.style.top = y + "px";
    divLoading.style.left = x + "px";
    //divLoading.style.height = height + "px";
    //divLoading.style.width = width + "px";
	
	
	var HTMLcontent;
	HTMLcontent = '<table width="198">';
		HTMLcontent += '<tr>';
    		HTMLcontent += '<td width="225" align="center" >' + text + '</td>';
  		HTMLcontent += '</tr>';
  		HTMLcontent += '<tr>';
		if(showLoadingImage)
    		HTMLcontent += '<td align="center"><img src="pictures/ajax-loader.gif" /></td>';
		else
			HTMLcontent += '<td>&nbsp;</td>';
		HTMLcontent += '</tr>';
	HTMLcontent += '</table>';
	
	divLoading.innerHTML = "" + HTMLcontent;
	
    document.body.appendChild(divLoading);
}

function closeLoadingDiv()
{
	
	if(document.getElementById('divLoading') != null)
	{
		var el = document.getElementById('divLoading');
		el.parentNode.removeChild(el);
	}
}