function opacity(id, opacStart, opacEnd, millisec) {
	//speed for each frame
	//alert(id)
	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);
	}
}

function blendimage(divid, imageid, imagefile, millisec) {
	var speed = Math.round(millisec / 100);
	var timer = 0;
	
	//set the current image as background
	document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
	
	//make image transparent
	changeOpac(0, imageid);
	
	//make new image
	document.getElementById(imageid).src = imagefile;

	//fade in image
	for(i = 0; i <= 100; i++) {
		setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
		timer++;
	}
}

function currentOpac(id, opacEnd, millisec) {
	//standard opacity is 100
	var currentOpac = 100;
	
	//if the element has an opacity set, get it
	if(document.getElementById(id).style.opacity < 100) {
		currentOpac = document.getElementById(id).style.opacity * 100;
	}

	//call for the function that changes the opacity
	opacity(id, currentOpac, opacEnd, millisec)
}
function VerLB(id,Nwdow,w,h)
		{
 			var myLightWindow = null;
	 		var myLightWindow = new lightwindow();
	 		myLightWindow.activateWindow({href:'ImagenDetalle.php?id='+id, title: ''+Nwdow+'', type: 'page', width:w,height:h});
		}


function VerLB2(id,Nwdow,w,h)
		{
 			var myLightWindow = null;
	 		var myLightWindow = new lightwindow();
	 		myLightWindow.activateWindow({href:'ImagenServiciosDetalle.php?id='+id, title: ''+Nwdow+'', type: 'page', width:w,height:h});
		}
		
		
////////////////////////////////////////////// Funciones CheckBox

function getElementsByTagName(node, tagName) { 
					tagName=tagName.toUpperCase(); 
					var els = []; 
					if (node.elements) 
					{ 
						node = node.elements; 
					} 
					for (i in node) 
					{ 
						if (node[i] && tagName == node[i].tagName) 
						{ 
							els.push(node[i]); 
							if (node[i].id) 
							{ 
								els[node[i].id] = node[i]; 
							} 
							/* Could also record nodes by name in els, but it's probably not worth the 
								 computation 
							*/ 
						} 
						/*should probably recurse; if so, test whether sub-nodes have already 
							been added to els. 
							*/ 
				
					} 
					return els; 
				} 
				
function setCheckedState (form, state) 
{ 
	if (!form) 
	{ 
		form = document; 
	}else
	{
		form = document.getElementById(form);
	}
	
	if (!form.getElementsByTagName) 
	{ 
		form.getElementsByTagName = function(tagName)
		{ 
			return getElementsByTagName(this, tagName); 
		} 
	} 

	var inputs = form.getElementsByTagName('input'); 
	for (i=0; i<inputs.length; ++i) 
	{ 
		if ('checkbox' == inputs[i].type.toLowerCase()) 
		{ 
			inputs[i].checked=state; 
		} 
	} 
} 
				
function checkAll(form) 
{ 
	setCheckedState(form, true); 
} 
				
function uncheckAll(form) 
{ 
	setCheckedState(form, false); 
}