/*getElementsByClass found on http://www.dustindiaz.com/getelementsbyclass/*/
/*other code by D. Pich*/

function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

function elementsByClassAreVisible(searchClass, style) {
	//move all mains
	var i, e;
	var left = 0, top = 0, width = 0, height = 0;
	var elems = getElementsByClass(searchClass, null, null);
	for(i=0;i<elems.length;i++) {
		e = elems[i];
		if(e.style.display == style) return true;
	}
	return false;
}

function showElementsByClass(searchClass, style) {
	//move all mains
	var i, e;
	var left = 0, top = 0, width = 0, height = 0;
	var elems = getElementsByClass(searchClass, null, null);
	for(i=0;i<elems.length;i++) {
		e = elems[i];
		e.style.display = style;
	}
}

function centerElementsByClass(searchClass) {
	var myWidth = 0, myHeight = 0;
	if( typeof( window.innerWidth ) == 'number' ) {
		//Non-IE
		myWidth = window.innerWidth;
		myHeight = window.innerHeight;
	} else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
		//IE 6+ in 'standards compliant mode'
		myWidth = document.documentElement.clientWidth;
		myHeight = document.documentElement.clientHeight;
	} else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
		//IE 4 compatible
		myWidth = document.body.clientWidth;
		myHeight = document.body.clientHeight;
	}
	
	//move all mains
	var i, e;
	var left = 0, top = 0, width = 0, height = 0;
	var elems = getElementsByClass(searchClass, null, null);
	for(i=0;i<elems.length;i++) {
		e = elems[i];
		//alert(e.style.left + ',' + e.style.top + ',' + e.style.width + '.' + e.style.height); 
		
		left = parseInt(e.style.left,10);
		width = parseInt(e.style.width,10);
		top = parseInt(e.style.top,10);
		height = parseInt(e.style.height,10);

		left = myWidth / 2 - width / 2;
		top = myHeight/ 2 - height / 2;
		e.style.left = left + 'px';
		e.style.top = top + 'px';
	}
}