function ajusteWidth(id) {
			if (is.ie5||is.ns6){
				this.obj = document.getElementById(id).style;
				this.obj.left = 0;
				this.obj.marginLeft = 0;
				this.obj.visibility="visible";
				return this.obj;
			} else if(is.ie4) {
				this.obj = document.all[id].style;
				this.obj.left = 0;
				this.obj.marginLeft = 0;
				this.obj.visibility="visible";
				return this.obj;
			} else if(is.ns4) {
				this.obj = document.layers[id];
				this.obj.left = 0;
				this.obj.marginLeft = 0;
				this.obj.visibility="show";
				return this.obj;
			}  
		}
		function ajusteHeight(id) {
			if (is.ie5||is.ns6){
				this.obj = document.getElementById(id).style;
				this.obj.top = 0;
				this.obj.marginTop = 0;
				this.obj.visibility="visible";
				return this.obj;
			} else if(is.ie4) {
				this.obj = document.all[id].style;
				this.obj.top = 0;
				this.obj.marginTop = 0;
				this.obj.visibility="visible";
				return this.obj;
			} else if(is.ns4) {
				this.obj = document.layers[id];
				this.obj.top = 0;
				this.obj.marginTop = 0;
				this.obj.visibility="show";
				return this.obj;
			}  
		}
		function retablirWidth(id) {
			if (is.ie5||is.ns6){
				this.obj = document.getElementById(id).style;
				this.obj.left = document.body.clientWidth/2;
				this.obj.marginLeft = -380;
				this.obj.visibility="visible";
				return this.obj;
			} else if(is.ie4) {
				this.obj = document.all[id].style;
				this.obj.left = document.body.clientWidth/2;
				this.obj.marginLeft = -380;
				this.obj.visibility="visible";
				return this.obj;
			} else if(is.ns4) {
				this.obj = document.layers[id];
				this.obj.left = document.body.clientWidth/2;
				this.obj.marginLeft = -380;
				this.obj.visibility="show";
				return this.obj;
			}  
		}
		function retablirHeight(id) {
			if (is.ie5||is.ns6){
				this.obj = document.getElementById(id).style;
				this.obj.top = document.body.clientHeight/2;
				this.obj.marginTop = -210;
				this.obj.visibility="visible";
				return this.obj;
			} else if(is.ie4) {
				this.obj = document.all[id].style;
				this.obj.top = document.body.clientHeight/2;
				this.obj.marginTop = -210;
				this.obj.visibility="visible";
				return this.obj;
			} else if(is.ns4) {
				this.obj = document.layers[id];
				this.obj.top = document.body.clientHeight/2;
				this.obj.marginTop = -210;
				this.obj.visibility="show";
				return this.obj;
			}  
		}
		function resizing() {
			if (document.body.clientWidth<760) ajusteWidth("container"); else retablirWidth("container");
			if (document.body.clientHeight<420) ajusteHeight("container"); else retablirHeight("container");
		}