Javascript function to get CSS properties in stylesheet file

CSS properties and Javascript Syntax

backgroundImage

function getBkImage(obj) {
var img =(obj.currentStyle) ?  obj.currentStyle.backgroundImage : getComputedStyle(obj,'').getPropertyValue('background-image');
return img;
}

visibility

function getVisibility(obj) {
var str =(obj.currentStyle) ?  obj.currentStyle.visibility : getComputedStyle(obj,'').getPropertyValue('visibility');
return str;
}

background-color

function getbkColor(obj) {
var str =(obj.currentStyle) ?  obj.currentStyle.backgroundColor : getComputedStyle(obj,'').getPropertyValue('background-color');
return str;
}

width

function getbkColor(obj) {
var str =(obj.currentStyle) ?  obj.currentStyle.width : getComputedStyle(obj,'').getPropertyValue('width');
return str;
}

z-index

function getbkColor(obj) {
var str =(obj.currentStyle) ?  obj.currentStyle.zIndex : getComputedStyle(obj,'').getPropertyValue('z-index');
return str;
}

getstyle

function getstyle(elem, prop) {
	if(document.defaultView) {
		return document.defaultView.getComputedStyle(elem, null).getPropertyValue(prop);
	}
	else if(elem.currentStyle) {
		var prop = prop.replace(/-(\w)/gi, function($0,$1) {
			return $1.toUpperCase();
		});
		return elem.currentStyle[prop];
	}
	else return null;
}